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December 19, 2014

December 19, 2014

Posted by **Tyler** on Thursday, April 15, 2010 at 5:12am.

sin 2x/sinx - cos2x/cosx = secx

- Pre Calculus -
**Reiny**, Thursday, April 15, 2010 at 8:40amUse sin 2x = 2sinxcosx and

cos 2x = 2cos^2x - 1

in the left side, it comes apart nicely

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