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September 23, 2014

September 23, 2014

Posted by **Gina** on Wednesday, November 11, 2009 at 3:32pm.

- Trig -
**Reiny**, Wednesday, November 11, 2009 at 4:36pmYou should have come across the identity

cos 2x = 1 - 2sin^2 x

so

cos 2x = 1 - A^2

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