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Calculus question

  1. May 27, 2008 #1
    1. The problem statement, all variables and given/known data

    I have the following expression:

    [tex]cos\theta = \frac{\vec{a}\cdot \vec{b}}{ab}[/tex]
    (this is simply taken from a dot product rule for two vectors)

    However I need to find [tex]\nabla_{\vec{r}i} \theta[/tex]

    Is there a way I can do it without involving differentials of arccos and the like? I can't use a small angle approximation as these angles are around 60-100 degrees. Any suggestions appreciated!
  2. jcsd
  3. May 27, 2008 #2
    Please confirm: You want to find the gradient of theta?
  4. May 27, 2008 #3
    It's ok, I read the question wrong. Sorry about that folks
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