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Math Help - Integral of sqr(1-x^2)

  1. #1
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    Integral of sqr(1-x^2)

    Using trig. substitution I get the following:
    -theta/2 + sin 2theta + C.

    When I write this in terms of x I get -(arccos x)/2 in place of -theta/2 however I am not sure how to convert sin 2theta. If it was just sine theta I wouldn't have a problem.
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  2. #2
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    sin(2 \theta) = 2 sin( \theta) cos( \theta)
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  3. #3
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    So it does. Thanks for that.
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