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Dot product between Spherical and Rectangular.

  1. Feb 8, 2009 #1
    Hello, I just have a question about dot products of different coordinate systems.
    I was wondering if anyone can explain why unit vector z(rect.) DOT unit vector r(spherical) is equal to cos(theta). As well, I was hoping if anyone could explain z DOT (Theta) = -sin(theta)?
  2. jcsd
  3. Feb 8, 2009 #2
    What is the definition of spherical coordinates?
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