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## Help on inverse trig differentiation

Hi, I kow about the chain rule and such; but there I cannot solve a problem in my calc textbook.

y = Arctan(x^2-1) + Arccscx, x > 1.

Answer on back says 0; but my answer didn't go to 0. BTW, this is just one problem from a HW assignment so this shouldn't count as cheating.

Thanks!

-Simfish

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 Recognitions: Homework Help Science Advisor The derivative should be zero because $$\tan^{-1} \sqrt{x^2-1} + \csc^{-1}x = \frac {\pi}{2}$$
 Recognitions: Gold Member Homework Help Science Advisor Sleazy Tide! Why didn't I see that..

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