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Please prove the following questionSin^2 x - cos^2 x = cos 2x

Please prove the following questionSin^2 x - cos^2 x = cos 2x

Grade:12

1 Answers

Arun
25750 Points
6 years ago
You have done a mistake of - sign
RHS
Cos 2x = cos (x+ x)
= Cos x *cos x - sin x *sin x
= Cos² x - sin² x
= LHS
Hence proved

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