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Homework Help: Parametric problem

  1. Mar 18, 2008 #1

    If f is a vector-valued function defined by f(t)=(e^(-t), cos(t)), find f''(t).
    I'm not even quite sure how to start.

    Any help would be loved! Thank you!
  2. jcsd
  3. Mar 18, 2008 #2
    Ok, let me clarify. I attempted to take the derivative of each separate part (thus, e^-t became -e^(-t) and so on), but I don't know what to do with it.
  4. Mar 18, 2008 #3
    What is the difference between ...

    [tex]f'(t)[/tex] vs [tex]f''(t)[/tex] ???

    Also, [tex]x=e^{-t}[/tex] and [tex]y=\cos t[/tex]


    You can take the derivative of each separately.
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