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January 26, 2015

January 26, 2015

Posted by **moi** on Monday, March 8, 2010 at 10:32pm.

sin^4 x-cos^4 x

- Pre Calculus -
**Damon**, Monday, March 8, 2010 at 10:55pm(sin^2x -cos^2x)(sin^2x+cos^2x)

but sin^2x+cos^2x = 1

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