Help on inverse trig differentiation

Simfish

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

Tide

The derivative should be zero because

[tex]\tan^{-1} \sqrt{x^2-1} + \csc^{-1}x = \frac {\pi}{2}[/tex]

arildno

Sleazy Tide!
Why didn't I see that..

Tide

Quote by arildno

Sleazy Tide!
Why didn't I see that..

LoL! Oh, you would have seen it - I just happened to see it first.

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Simfish Blog Entries: 1 Recognitions: Gold Member	Help on inverse trig differentiation Tweet 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

Tide Recognitions: Homework Help Science Advisor	The derivative should be zero because [tex]\tan^{-1} \sqrt{x^2-1} + \csc^{-1}x = \frac {\pi}{2}[/tex]

arildno Recognitions: Gold Member Homework Help Science Advisor	Sleazy Tide! Why didn't I see that..