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

What is the value of [(cos 3 theta + 2cos 5 theta+ cos 7 theta)/(cos theta + 2cos 3 theta + cos 5 theta)] + sin 2 theta tan 3 theta ? [(cos 3 theta + 2cos 5 theta+ cos 7 theta)/(cos theta + 2cos 3 theta + cos 5 theta)] + sin 2 theta tan 3 theta का मान क्या है?

Prove that (cos3 theta+2cos5 theta+cos7 theta)/(cos theta+2cos3 theta+cos5 theta)=cos2 theta-sin2 theta tan3 theta

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

cos 3theta+cos 5theta+cos 7theta+cos 9theta=4 cos theta cos 2theta cos 6theta .

Prove that (sin theta + sin 3theta+ sin 5 theta + sin 7theta)/(cos theta + cos 3theta + cos 5 theta + cos 7theta) = (tan 3theta + tan theta)/(1 - tan 3theta tan theta) .

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

If cos theta + cos 2theta + cos 3theta = 0 then theta =

2 cos theta - cos 3 theta - cos 5 theta - 16 cos^(3) theta sin^(2) theta =