Cos 3A Formula โ Proof and Examples
Here you will learn what is the formula of cos 3A with proof and examples based on it. Letโs begin โ Cos 3A Formula The formula of cos 3A is \(4 cos^3 A โ 3 cos A\). Proof : We have, cos (A + B) = cos A cos B โ sin A sin B โฆ
