关于添加小量eps处理分母为零的疑问

bjb05

我求了一个符号表达式，很长：
a5 =

1/520/(sin(acos(260*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2))+atan((180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))))^2*(-(260*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)+130*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)/((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)*(2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))))/(1-67600*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)^2*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2))^(1/2)+((-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))-(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))/(1+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2))^2+cos(acos(260*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2))+atan((180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))))^2*(-(260*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)+130*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)/((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)*(2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))))/(1-67600*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)^2*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2))^(1/2)+((-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))-(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))/(1+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2))^2)^(1/2)*(2*sin(acos(260*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2))+atan((180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))))^2*(-(260*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)+130*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)/((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)*(2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))))/(1-67600*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)^2*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2))^(1/2)+((-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))-(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))/(1+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2))*(-(260*((1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))^2+(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(12000*cos(10*t)+240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^2/lBC^2/(1-sin(w1*t)^2*lAB^2/lBC^2)+240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*sin(w1*t)*w1^2*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^3/lBC^3/(1-sin(w1*t)^2*lAB^2/lBC^2)^(3/2)*sin(w1*t))+(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(12000*sin(10*t)+240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^2/lBC^2/(1-sin(w1*t)^2*lAB^2/lBC^2)+240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*sin(w1*t)*w1^2*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^3/lBC^3/(1-sin(w1*t)^2*lAB^2/lBC^2)^(3/2)*sin(w1*t)))*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)+260*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))/((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)*(2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))-65*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)/((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(3/2)*(2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))^2+130*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)/((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)*(2*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))^2+2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(12000*cos(10*t)+240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^2/lBC^2/(1-sin(w1*t)^2*lAB^2/lBC^2)+240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*sin(w1*t)*w1^2*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^3/lBC^3/(1-sin(w1*t)^2*lAB^2/lBC^2)^(3/2)*sin(w1*t))+2*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))^2+2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(12000*sin(10*t)+240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^2/lBC^2/(1-sin(w1*t)^2*lAB^2/lBC^2)+240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*sin(w1*t)*w1^2*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^3/lBC^3/(1-sin(w1*t)^2*lAB^2/lBC^2)^(3/2)*sin(w1*t))))/(1-67600*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)^2*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2))^(1/2)+1/2*(260*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)+130*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)/((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)*(2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))))/(1-67600*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)^2*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2))^(3/2)*(-135200*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))-67600*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)^2*(2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))))+((12000*sin(10*t)+240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^2/lBC^2/(1-sin(w1*t)^2*lAB^2/lBC^2)+240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*sin(w1*t)*w1^2*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^3/lBC^3/(1-sin(w1*t)^2*lAB^2/lBC^2)^(3/2)*sin(w1*t))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))-2*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^3*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))^2-(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2*(12000*cos(10*t)+240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^2/lBC^2/(1-sin(w1*t)^2*lAB^2/lBC^2)+240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*sin(w1*t)*w1^2*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^3/lBC^3/(1-sin(w1*t)^2*lAB^2/lBC^2)^(3/2)*sin(w1*t)))/(1+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)-((-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))-(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))/(1+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^2*(2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))-2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^3*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))))+2*cos(acos(260*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2))+atan((180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))))^2*(-(260*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)+130*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)/((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)*(2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))))/(1-67600*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)^2*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2))^(1/2)+((-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))-(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))/(1+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2/(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2))*(-(260*((1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))^2+(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(12000*cos(10*t)+240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^2/lBC^2/(1-sin(w1*t)^2*lAB^2/lBC^2)+240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*sin(w1*t)*w1^2*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^3/lBC^3/(1-sin(w1*t)^2*lAB^2/lBC^2)^(3/2)*sin(w1*t))+(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(12000*sin(10*t)+240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^2/lBC^2/(1-sin(w1*t)^2*lAB^2/lBC^2)+240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*sin(w1*t)*w1^2*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^3/lBC^3/(1-sin(w1*t)^2*lAB^2/lBC^2)^(3/2)*sin(w1*t)))*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)+260*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))/((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)*(2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))-65*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)/((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(3/2)*(2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))^2+130*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)/((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)*(2*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))^2+2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(12000*cos(10*t)+240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^2/lBC^2/(1-sin(w1*t)^2*lAB^2/lBC^2)+240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*sin(w1*t)*w1^2*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^3/lBC^3/(1-sin(w1*t)^2*lAB^2/lBC^2)^(3/2)*sin(w1*t))+2*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))^2+2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(12000*sin(10*t)+240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^2/lBC^2/(1-sin(w1*t)^2*lAB^2/lBC^2)+240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*sin(w1*t)*w1^2*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)^2*w1^2*lAB^3/lBC^3/(1-sin(w1*t)^2*lAB^2/lBC^2)^(3/2)*sin(w1*t))))/(1-67600*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)^2*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2))^(1/2)+1/2*(260*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2)))*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)+130*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)/((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2)^(1/2)*(2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(1200*sin(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))+2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))*(-1200*cos(10*t)-240*cos(asin(sin(w1*t)*lAB/lBC)+1/3*pi)*cos(w1*t)*w1*lAB/lBC/(1-sin(w1*t)^2*lAB^2/lBC^2)^(1/2))))/(1-67600*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13800)^2*((500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2))^(3/2)*(-135200*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(…………



用subs带入数据时总是提示："Warning: Divide by zero.”
在论坛里搜索也只是找到已知一个简单的表达式在除以符号时，加一个小量，现在我的表达式这么长，也不知道分母有哪些，怎么加小量呢？
有什么其他的解决方法？谢谢

[ 本帖最后由 eight 于 2007-12-7 15:46 编辑 ]

xjzuo

虽然你的这个问题可以直接用[n,d]=numden()试试。
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但我还是想讲几句：
本论坛鼓励问问题的完整性，这有利于讨论和迅速解决问题，也有利于论坛整体水平的提高。

你这种没头没脑的提问，往往叫别人也摸不着头脑，也无法判断你的结果是否有问题。

eight

原帖由 bjb05 于 2007-12-6 22:39 发表

                               
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我求了一个符号表达式，很长：
a5 =

1/520/(sin(acos(260*(1/2*(500-120*cos(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+1/2*(180-120*sin(10*t)-240*sin(asin(sin(w1*t)*lAB/lBC)+1/3*pi))^2+13 ...

彻底无语了，你说你这样提问有谁愿意回答？这么大堆数字，看着多烦？

whatman

表达式这么长，victory: ，晕了

w89986581

你的数据这么长，不是手动输入的吧？应该是前一条命令生成的吧，建议在这条命令之前去查找非零的项。