Prove sin 3A cos A -cos 3A sin A - 2 2A

sin 3Acos A+cos 3Asin A= 2 cot 2A =sin 3A · sin A + cos 3A· cos Acos a sin A ⇒2 cos(2A)sin 2A= 2 cot 2A ...

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Introduction

Prove sin 3...

Question

Prove $\frac{sin 3 A}{cos A} + \frac{cos 3 A}{sin A} = 2 cot 2 A$

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Solution

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