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Math Help - derivatives of "arcs"

  1. #1
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    derivatives of "arcs"

    how do you do this problem:
    arctan(y^9)
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  2. #2
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    Krizalid's Avatar
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    You're expected to know that the derivative of \arctan x equals \frac1{1+x^2}. By the Chain Rule, we have that the derivative of \arctan y^9 equals \frac1{1+y^{18}}\cdot(y^9)'.
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