Prove that :`tan 4 theta = (4 tan theta - 4 tan^3 theta)/(1-6 tan^2 theta + tan^4 theta)`.
Channel: Doubtnut
Date: 2020-04-05

Prove that :`tan 4 theta = (4 tan theta - 4 tan^3 theta)/(1-6 tan^2 theta + tan^4 theta)`.