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Homework Help: Derivative in spherical coordinates

  1. Dec 3, 2016 #1
    1. The problem statement, all variables and given/known data
    dmund.JPG -here is the problem statement

    dmund2.JPG -here is a bit of their answer
    2. Relevant equations
    Chain rule, partial derivative in spherical coord.

    3. The attempt at a solution
    I tried dragging out the constant and partial derivate with respect to t but still I can't reach their df/dt and d^2f/dt^2 partial derivatives.
    Any help would be much appreciated.
    Thank you !
  2. jcsd
  3. Dec 3, 2016 #2


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    Science Advisor
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    Please post your attempts anyway.
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