SOLUTION: verify that cos squared x- sin squared x= 2cos squared x-1

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Question 1092885: verify that
cos squared x- sin squared x= 2cos squared x-1
Answer by Alan3354(69443) About Me  (Show Source):
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verify that
cos squared x- sin squared x= 2cos squared x-1
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verify that
cos^2 - sin^2 = 2cos^2 - 1
cos^2 - (1 - cos^2) = 2cos^2 - 1
2cos^2 - 1 = 2cos^2 - 1