Posted by **Shadow** on Wednesday, April 3, 2013 at 10:50pm.

Verify the identities.

Cos^2x - sin^2x = 2cos^2x - 1

When verifying identities, can I work on both side?

Ex.

1 - sin^2x - sin^2x = 1 - 2sin^2x

1 - 2sin^2x = 1 - 2sin^2x

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