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Derivative of modulus of a function

  1. Aug 24, 2013 #1
    how do we take derivative of modulus of a function??
  2. jcsd
  3. Aug 25, 2013 #2


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    hi nil1996! :smile:

    |f(x)| = f(x) times sign(f(x))

    so you can use the product rule, except where f(x) = 0 (where |f|' won't exist unless f' = 0) :wink:
  4. Sep 2, 2013 #3
    Are you talking about a function of a real or complex variable?
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