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Difficult derivative involving vectors and trig

  1. Oct 5, 2012 #1

    I am working through some very old (1980's) computer code and need to understand how a particular derivative was calculated. Can someone explain to me how it is that if:





    [itex]\frac{d\phi}{d\vec{f}} = -\frac{\left|g\right|}{\left|a\right|^2}\cdot\vec{a}[/itex]?

    I would very much appreciate any help with this!

    Thanks :)
  2. jcsd
  3. Oct 6, 2012 #2


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    Have you tried differentiating sin phi wrt f?
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