" iii) "cos2 theta+cos8 theta=cos5 theta

Solve cos2theta+cos8theta=cos5theta

Solve the following equations Cos 2 theta + cos 8 theta = Cos 5 theta

If 13 theta =pi , " prove that " cos theta cos 2theta cos3 theta cos4theta cos5 theta cos6 theta =1/2^(6)

Let f(theta)=cos theta cos2 theta cos3 theta cos4 theta cos5 theta cos6 theta and f((2 pi)/(13))=P. Find value of 2^(8)|P|

Prove (cos 3theta+ 2 cos 5theta+ cos 7theta)/( cos theta+ 2 cos 3theta+ cos 5theta)= cos 2theta- sin 2theta tan 3theta .

If cos theta + cos 7theta + cos 3theta + cos 5 theta =0, then theta is

If cos 2theta + cos 8theta = cos 5theta then theta =

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