sin-sin-3-sin5-cos-cos-3-cos-5-tan-3-

Question Number 20703 by tammi last updated on 01/Sep/17

\frac{\sin α + \sin 3 α + \sin 5 α}{\cos α + \cos 3 α + \cos 5 α} = \tan 3 α

Commented by myintkhaing last updated on 01/Sep/17

L . H . S = \frac{2 \sin 3 α \cos 2 α + \sin 3 α}{2 \cos 3 α \cos 2 α + \cos 3 α} = \frac{\sin 3 α}{\cos 3 α} = \tan 3 α

proved

Answered by myintkhaing last updated on 01/Sep/17