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Homework Help: Find the derivative.

  1. Jan 28, 2012 #1
    1. The problem statement, all variables and given/known data

    Find the derivative. Simplify where possible.

    xtanh-1x + ln[itex]\sqrt{1-x^2}[/itex]

    2. Relevant equations

    3. The attempt at a solution

    (x/1+x2) + tanh-1x - (x/1-x2)

    How would I go about make this problem simplified as possible if the above answer is correct.
    Last edited: Jan 28, 2012
  2. jcsd
  3. Jan 28, 2012 #2


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    welcome to pf!

    hi neosonata! welcome to pf! :wink:
    nooo :redface:

    that's for tan-1x :smile:
  4. Jan 28, 2012 #3

    Simon Bridge

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  5. Jan 28, 2012 #4
    Re: welcome to pf!

    He must have written it wrong since that would just be X^3.
  6. Jan 28, 2012 #5
    Ah that make sense.. silly me :p

    it should be

    (x/1-x^2) + tanh^(-1)x - (x/1-x^2)

    which leaves


    Thanks for the help guys
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