## Cos3x Formula in terms of Cosx, Sinx [with Proof]

Cos3x formula in terms of cosx is as follows: 4cos3x-3cos x. In this post, we will also derive the cos3x formula in terms of sinx and give some examples. These formulas are very useful to solve trigonometric equations and simplify trigonometric expressions. Cos3x Formula Cos3x is the cosine function of a triple angle 3x. The … Read more