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September 5, 2015
Posted by **Anonymous** on Friday, October 12, 2012 at 3:33pm.

- Math -
**Steve**, Friday, October 12, 2012 at 3:48pmif you mean

y=(cos x+sin x)/(cos x -sin x)

y' = 2/(cosx - sinx)^2

using the quotient rule, you get a bunch of terms cancelling in the numerator.