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Gamma angle

  1. Feb 24, 2009 #1
    For two arbitrary vectors, subtending an angle, [tex] \gamma [/tex], I know the cos relationship, but what's the sin relationship ? I ask because there is an ambiguity by only knowing the cosine form, since vector A can be either above or below vector B.

    [tex] cos\gamma = cos\theta_1 cos\theta_2 + sin\theta_1 sin\theta_2 cos( \phi_1 - \phi_2 ) [/tex]

    I don't know what's the correct term I should type in for search engine.
  2. jcsd
  3. Feb 24, 2009 #2


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    Science Advisor

    It would clarify things if you could state what all these angles are and their relationships.
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