# Prove that [(sin 7x + sin 5x ) + (sin 9x + sin 3x )] / [(cos 7x + cos 5x ) + (cos 9x + cos 3x )] = tan 6x

78.8k views

edited

Prove that [(sin 7x + sin 5x ) + (sin 9x + sin 3x )] / [(cos 7x + cos 5x ) + (cos 9x + cos 3x )] = tan 6x

by (13.6k points)
selected

Proof is given as:

by (16 points)
Thanks

+1 vote