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Could someone please prove this identity

  1. Oct 18, 2006 #1
    tan3A= 3tanA-tan3A/1-3tan^2 A
     
  2. jcsd
  3. Oct 18, 2006 #2
  4. Oct 18, 2006 #3

    HallsofIvy

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    This is the third time that question has been posted in the last few days!
     
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