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September 23, 2014

September 23, 2014

Posted by **Ruby** on Thursday, March 8, 2012 at 8:32am.

- trig -
**drwls**, Thursday, March 8, 2012 at 8:49amNote that cosx*secx = 1

so (cosx*secx)^2 = 1 also.

Your expression is therefore

1 - cos^2x = sin^2x

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