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Help on inverse trig differentiation

  1. Nov 2, 2004 #1

    Simfish

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    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
     
    Last edited: Nov 2, 2004
  2. jcsd
  3. Nov 2, 2004 #2

    Tide

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    The derivative should be zero because

    [tex]\tan^{-1} \sqrt{x^2-1} + \csc^{-1}x = \frac {\pi}{2}[/tex]
     
  4. Nov 2, 2004 #3

    arildno

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    Dearly Missed

    Sleazy Tide!
    Why didn't I see that..:grumpy:
     
  5. Nov 2, 2004 #4

    Tide

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