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Breaking up two trig functions

  1. Jan 29, 2013 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
    ok can someone explain to me how this is done. I have no idea how in hell it got broken into those two.

    Attached Files:

  2. jcsd
  3. Jan 29, 2013 #2
    Search for "product to sum formulas"
  4. Jan 29, 2013 #3
    wow i'm stupid
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