# Prove: sinØ/(1-cosØ) - (1 cosØ)/sinØ = 0

**Question description**

I believe I need to use this: sin²θ = 1-cos²θ

But, how do I do that?

The textbook does not have any example problems similar to this at all!

Thanks for any help and explanations. I have several pages of these to finish, so if you can help explain how to do this one, I hopefully will be able to finish the rest more easily.

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