Cos2A+1what is it equivalent to?

asked Jun 10, 2023 92.4k views

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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,

$2\cos ^2A$

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