Not sure how to approach this problem:

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- November 10th 2008, 06:03 AMcasey_kTrig Identities
Not sure how to approach this problem:

- November 10th 2008, 06:13 AMChop Suey

Multiply by to get:

Take common factor, and we're done. - November 10th 2008, 06:19 AMChop Suey
- November 10th 2008, 07:05 AMSoroban
Hello, casey_k!

Another approach . . .

Quote:

We have: .

Multiply by