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## Homework Statement

Prove:

Tan^2 - sin^2 = sin^4*Sec^4

This one I am having trouble with... My thought is that I need to make a fraction on the lift side some how ... then cross multiply then some how remove the denominator...?

Can some one please give me a hint.. thank you.

## The Attempt at a Solution

Tan^2 - sin^2

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= sin^2/cos^2 - sin^2

=sin^2/cos^2 - sin^4/sin^2