Question

Prove:
\[\LARGE \frac{\sin11xsinx+\sin7xsin3x}{\cos11xsinx+\cos7xsin3x}=\tan8x\]

Answer 1

APPLY

Answer 2

**\[\cos(2u)=2\cos^2(u)-1\]

Answer 3

can you please check if you have copied the question correctly,

Answer 4

well it can not be proved because it is a false statement