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Homework Help: Converting degree into variable 'x'

  1. Nov 26, 2007 #1
    1. The problem statement, all variables and given/known data
    After integrating x²/(sqrt1-x²) using the triangle method and thereby substituting sin¤ for x, I ended up with the result 1/2¤-1/2sin2¤+c. For my answer toge complete, I must have the ¤ in x format. I managed to convert the 1/2¤, which is simply 1/2arcsinx but I couldn't for 1/2sin2¤, my answer did not agree with the textbook's which read 1/2x(sqrt1-x²)....

    My computer won't read latex at the moment so please excuse the amateur notation. Thank you.

    2. Relevant equations
    I think I covered it all above!
  2. jcsd
  3. Nov 27, 2007 #2
    sin2x = 2sinx.cosx
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