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September 19, 2014

September 19, 2014

Posted by **Peter** on Thursday, April 15, 2010 at 5:11am.

(cosx/2-sinx/2)^2=1-sin x

- Pre Calculus -
**Reiny**, Thursday, April 15, 2010 at 8:43amHint:

sin 2A = 2sinAcosA

treat x/2 as A

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