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Cos2A+1what is it equivalent to?
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Cos2A+1what is it equivalent to?

User Billie
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1 Answer

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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

User Haris Ur Rehman
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