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Math Help - Trigonometric Substitutions - help!

  1. #1
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    Oct 2009
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    Trigonometric Substitutions - help!

    im stuck on this question:


    i let x = 4sint
    dx= 4cost dt

    so
    = == =

    i dont see why im getting a total wrong answer :S
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  2. #2
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    Jan 2010
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    Your images aren't working for me.
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