Question

Cos2A+1what is it equivalent to?

Answer 1

Simplify the expression by using identities of trigonometry.

`\begin{gathered} \cos 2A+1=\cos ^2A-\sin ^2A+(\cos ^2A+\sin ^2A) \\ =2\cos ^2A \end{gathered}`

So answer is,

`2\cos ^2A`