hey guys having trouble simplying this expression. Any help? thank u

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- Sep 9th 2008, 08:33 AMjvignacioSimplifying the expression
hey guys having trouble simplying this expression. Any help? thank u

- Sep 9th 2008, 09:03 AMKrizalid
Use the double angle formulae for sin and cosine.

(Sorry for my poor help but I'm in a rush.) - Sep 9th 2008, 09:08 AMChop Suey
- Sep 9th 2008, 09:19 AMjvignacio
- Sep 9th 2008, 09:34 AMjvignacio
- Sep 9th 2008, 09:40 AMChop Suey
You only needed to change the 2sin3xcos3x and (cos^2(3x) - sin^2(3x)).

Then, you'll see that this fits the sum identitiy for sine. Recall that:

- Sep 9th 2008, 09:43 AMjvignacio
- Sep 9th 2008, 09:45 AMChop Suey
- Sep 9th 2008, 09:58 AMjvignacio