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Homework Help: Second partial derivative wrt x

  1. Jul 15, 2014 #1
    I just need some clarification that this is fine

    so I have

    [tex]f_{x} = -2xe^{-x^2-y^2}cos(xy) -ysin(xy)e^{-x^2-y^2}[/tex]

    now, taking the second derivative

    [tex]f_{xx} = [-2xe^{-x^2-y^2}+4x^2e^{-x^2-y^2}]cos(xy) - ysin(xy)[-2xe^{-x^2-y^2}]+2xe^{-x^2-y^2}sin(xy)y-cos(xy)e^{-x2-y^2}y^2[/tex]
  2. jcsd
  3. Jul 15, 2014 #2
    The very first ##x## in the first term shouldn't be there. Otherwise it looks fine.
  4. Jul 15, 2014 #3
    oh yeah, on my paper I didnt have it but I typed it into this

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