Question

cos2x=?what is formula​

Answer 1

Answer:

The formulas of Cos(2x) are as follows: (1 - Tan²x) ÷ (1 + Tan²x)

Answer 2

Step-by-step explanation:

$\cos2x = 2 \cos{}^{2}x - 1 \\ or \: \: 1 - 2 \sin{}^{2}x \\ or \: \: \cos{}^{2}x - \sin{}^{2}x$

hope it helps you