`4cos6thetacos4thetacos2theta=`

Prove the following: 16sinthetacosthetacos2thetacos4thetacos8theta=sin16theta

cos3thetacos5theta-cos7thetacos9theta=0

find the general values of ' theta ' from the following equations cos3thetacos5theta-cos7thetacos9theta=0

Solve : costhetacos2thetacos3theta=1/4 , 0lethetalepi

Find the sum of the series 1+cos^2theta+cos^2thetacos2theta+cos^3 theta cos3theta+… to oo

Solve: costhetacos2thetacos3theta=1/4 , where 0 lethetalex .

Solve: costhetacos2thetacos3theta=1/4 , where 0 lethetalex .

If theta=7.5^(@) Find the value of quad sin8 theta*cos theta-sin6 theta cos3 thetacos2 theta*cos theta-sin3 theta*sin4 theta

If theta=(2pi)/(2009), then costhetacos 2thetacos3theta... cos1004theta is

If theta=(2pi)/(2009), then costhetacos 2thetacos3theta... cos1004theta is