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Question

I need help proving this identity
2sin^2x - 1 = sin^2x - cos^2x
10 years ago

Answers

Reiny
This one's really easy ...

RS = sin^2 x - cos^2 x
= sin^2 x - (1 - sin^2 x)
= 2sin^2 x - 1
= LS
10 years ago

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