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Trig - Double Angles Questions, Please Help

  1. Nov 17, 2007 #1
    Trig - Double Angles Questions, Please Help!!

    please close, solved all my problems myself...
    Last edited: Nov 17, 2007
  2. jcsd
  3. Nov 17, 2007 #2
    first off, your double-angle identities are wrong



  4. Nov 17, 2007 #3
    what are you talking about? they're exactly the same
  5. Nov 17, 2007 #4
    your signs are off, i haven't checked your work though
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