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Math Help - Help with trig substition

  1. #1
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    Help with trig substition

    How is the following integrated?

    \int \sqrt{1-4x^2} \,dx
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  2. #2
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    try x = \frac{1}{2}\sin t
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  3. #3
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    I tried that, but I can't find any errors in my work, and I got a different answer than my book did.
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  4. #4
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    Show me your workings.
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  5. #5
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    I found my error going back over it to type it in. Thanks
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