" (b) "(a cos theta,a sin theta)" and "(a cos phi,a sin phi)

If the distance between two points (a cos theta,a sin theta) and (a cos phi,a sin phi) is 2a then theta is

If the distance between the points (a cos theta, a sin theta ) and (a cos phi, a sin phi) is 2a, theta=

Find the slope of the line joining the points (a cos theta , b sin theta) and (a cos phi, b sin phi)

If the line joining the points (a cos theta , b sin theta) and (a cos phi, b sin phi) .Prove that the equation of this lines is x/a "cos" (theta + phi)/2 + y/b"sin" (theta + phi)/2 = "cos" (theta -phi)/2

If a=cos theta+i sin theta and b= cos phi + i sin phi then prove that a^3/b^3+b^3/a^3=2cos3(theta-phi)

If A=[(cos^2theta,costheta sintheta),(cos theta sintheta, sin^2theta)] and B=[(cos^2 phi, cos phi sin phi),(cos phisinphi,sin^2phi)], show that AB is zero matrix if theta and phi differ by an odd multiple of pi/2.