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Half angle formula assistance

  1. Apr 22, 2009 #1
    1. The problem statement, all variables and given/known data
    given that sin theta = 3/5, 0 < theta < pi/2 find sin theta/2

    2. Relevant equations
    http://www.intmath.com/Analytic-trigonometry/sinalphaon2.gif [Broken]

    3. The attempt at a solution
    I appologize that I don't know how to use all the symbols on a keyboard (square roots, etc)
    But I have so far gotten it to :

    square root of 1-3/5 all over 2. I have a sample of this same problem in my book, but they don't explain the next step. Suddenly this problem from here just turns into square root of 1/5...can someone please explain how they got to there?

    Thank you all.
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Apr 22, 2009 #2
    ok i feel like the biggest idiot in the world...i got it.

    I blame sleep deprivation...haha.
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