hey guys having trouble simplying this expression. Any help? thank u
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Use the double angle formulae for sin and cosine. (Sorry for my poor help but I'm in a rush.)
Originally Posted by Krizalid Use the double angle formulae for sin and cosine. (Sorry for my poor help but I'm in a rush.) Just to add more: ================== Do you see the pattern here?
Originally Posted by Chop Suey Just to add more: ================== Do you see the pattern here? yes yes i see it. so using these double angled formulas i answer this question
Originally Posted by Chop Suey Just to add more: ================== Do you see the pattern here? ok so: simplifys to: this correct?
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:
Originally Posted by Chop 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: yes yes thats right. so its sin6xcos5x-cos6xsin5x ?
Originally Posted by jvignacio yes yes thats right. so its sin6xcos5x-cos6xsin5x ? Yes. Don't doubt yourself. And don't forget:
Last edited by Chop Suey; September 9th 2008 at 05:42 PM.
Originally Posted by Chop Suey Yes. Don't doubt yourself. And don't forget: thanks man, will do. appreciate the help
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