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Math Help - Arc Length

  1. #1
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    Joined
    Jan 2009
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    Arc Length

    I don't understand how to get from this:
    S = 2\pi \int \frac{x^3}{3} \sqrt{1+x^4} dx [0,3]
    to this:
    <br />
= \frac{\pi}{6} \int (1+x^4)^{1/2}(4x^3) dx [0,3]

    The only thing I understand really is rewriting the square root.
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  2. #2
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    Joined
    Jan 2009
    Posts
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    They are the same thing can't you see. It's just reaarangements of coefficients.. And 2/3 = 4/6.

    -O
    Last edited by mr fantastic; February 7th 2009 at 08:02 PM. Reason: Removed link not relevant to question (looks like a signature but isn't)
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