![]() Theta2 := unapply(arctan(r*sin(theta)/(r*cos(theta)+a)), a) Theta1 := unapply(arctan(r*sin(theta)/(r*cos(theta)-a)), a) As "G "physically represents energy it must be a positive value. Reason: value of G: integration in 0 to pi/4 gives some value but for 0 to pi it evaluates to zero and so is the case with 0 to 2*Pi. There is a restriction that theta1 should lie between -Pi to Pi and theta2 between 0 to 2*Pi. I see there is an error in the final expression G. I expressed everything in terms of 'a' as a function of 'a' at first. I want to take derivative of F with respect to a. r1, r2,theta1,theta2 are function of r, theta and a. I have a function F of variables (r1,r2,theta1,theta2,r,theta,a). Following the comments I am editing this post: ![]()
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