If `theta=pi/7`,prove that `costhetacos2thetacos3theta=1/(2^3)`

costheta.cos2theta.cos3theta=1/4

If theta = pi/7 prove that cos theta* cos 2theta * cos 3theta = 1/8

If theta=pi/(2^n+1) , prove that: 2^ncosthetacos2thetacos2^2thetacos2^(n-1)theta=1.

If theta=pi/(2^n+1) , prove that: 2^ncosthetacos2thetacos2^2theta....... cos2^(n-1)theta=1.

cos3thetacos5theta-cos7thetacos9theta=0

Prove: tan^2thetacos^2theta=1-cos^2theta

If theta=pi/(2^n+1) , prove that: 2^ncosthetacos2thetacos2^2 cos2^(n-1)theta=1.

If theta=pi/(2^n+1) , prove that: 2^ncosthetacos2thetacos2^2 cos2^(n-1)theta=1.

If 0ltthetaltpi, " then solve" costheta.cos2theta.cos3theta=1//4

Prove that, If " "15 theta = pi, "show that," cos theta cos2 theta cos3theta cos 4theta cos5 theta cos6theta cos7theta =1/2^(7)