Calculus question

  • Thread starter raintrek
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  • #1
raintrek
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Homework Statement



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!
 

Answers and Replies

  • #2
e(ho0n3
1,357
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Please confirm: You want to find the gradient of theta?
 
  • #3
raintrek
75
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It's ok, I read the question wrong. Sorry about that folks
 

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