Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Science Advisor

    It would clarify things if you could state what all these angles are and their relationships.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook