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posted by Britney on Saturday, March 24, 2012 at 11:53am.

Verify only working with one side: cos^2x + tan^2x cos^2x = 1

tan^x*cos^2x can be replaced with sin^2x, since tan^2x = sin^2x/cos^2x cos^2 + sin^2x = 1 q.e.d.

Thank you.!

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