Proofs of Triple Angle Identities

Lesson#3 <br />Proofs of Triple Angle Identities <br />Triple Angle Identities <br />1) sin⁡3α=3 sin⁡α−4 sin^3 α <br />2) cos 3α=4 cos^3 α−3 cosα <br />3) tan⁡3α=(3 tan⁡α−tan^3 α)/(1−3tan^2 α) <br />Math.Ex.10.3, Part3-10.3 <br />Prove the following identity: <br />sin⁡3α=3 sin⁡α−4 sin^3 α <br />cos 3α=4 cos^3 α−3 cosα <br />tan⁡3α=(3 tan⁡α−tan^3 α)/(1−3tan^2 α) <br />Trigonometric Identities <br />Chapter No 10 <br />Exercise No 10.3 <br />Mathematics <br />part 1