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Can someone explain where

  1. Oct 29, 2005 #1
    can someone explain where the 3x comes from in the below example

    y = e^(sec 3x)

    dy/dx = e^(sec 3x) * d/dx(sec 3x)
    = e^(sec 3x) * sec 3x tan 3x d/dx(3x)
    where does this come from??
  2. jcsd
  3. Oct 29, 2005 #2
    Apply the chain rule to sec(3x).
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