Asked by Britney

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

13 years ago

Answered by drwls

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.

13 years ago

Answered by Britney

Thank you.!

13 years ago

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