Solve for `theta:`
`cos theta-cos7 theta=sin4 theta`

cos theta-cos3 theta+cos5 theta-cos7 theta=4sin theta sin4 theta cos2 theta

Solve sin^(3)theta cos theta-cos^(3)theta sin theta=(1)/(4)

Solve :cos theta+cos3 theta+cos5 theta+cos7 theta=0

Prove the following identities : (sin theta +sin 3 theta + sin 5 theta + sin 7theta)/(cos theta + cos 3 theta + cos 5 theta + cos 7 theta)=tan 4 theta

8 sin theta * cos theta * cos 2 theta * cos 4 theta = A) sin 4 theta B) sin 8 theta C) sin 16 theta D) cos 8 theta

Solve cos theta+cos 7 theta+cos 3theta+cos 5 theta=0 ,

Solve cos theta+cos 7 theta+cos 3theta+cos 5 theta=0 ,

(sin theta + cos theta)/(sin theta - cos theta) + (sin theta - cos theta)/(sin theta + cos theta)= ________

Prove that ( cos theta + cos 2 theta + cos 3 theta + cos 4 theta)/(sin theta + sin 2 theta + sin 3 theta + sin 4 theta)= cot ""(5theta)/(2).

Prove the following : sin theta+ sin 3 theta+ sin 5 theta+sin 7 theta=4 cos theta cos2 theta sin4 theta .