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May 6, 2016
Posted by **Kakashi** on Sunday, January 11, 2009 at 8:30am.

secx-secx sin^2x= cosx

thanks

- math (trigonometry) -
**drwls**, Sunday, January 11, 2009 at 9:52amsec x (1 - sin^2x) = cos x

sec x * cos^2 x = cos x

(1/cos x)*(cos^2 x) = cos x

cos x = cos x