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GRIFFITH 3.18 Please explain how they got this

  1. Feb 18, 2008 #1
    [SOLVED] GRIFFITH 3.18 Please explain how they got this

    1. The problem statement, all variables and given/known data
    The potential at the surface of a sphere (radius R) is given by Vo=kcos3[tex]\theta[/tex]\where k is a constant. find the potential inside and outside the sphere.

    2. Relevant equations
    Their first step was:
    Vo([tex]\theta[/tex]) = k[4cos^3[tex]\theta[/tex] - 3cos[tex]\theta[/tex] ]

    how did they get this?

    3. The attempt at a solution
  2. jcsd
  3. Feb 18, 2008 #2
    trig ID!
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