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Verify trigonometric identity

  1. Nov 3, 2008 #1
    1. The problem statement, all variables and given/known data
    tanX+tan Y / 1-tanXtanY= cotX+cotY/cotXcotY-1

    2. Relevant equations

    tan= sin/cos
    cot= cos/sin

    3. The attempt at a solution
  2. jcsd
  3. Nov 4, 2008 #2
    Attempt at a solution?

    Try substituting those equations into your problem. Where does that get you?
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