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Math Help - length of a curve help needed

  1. #1
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    length of a curve help needed

    Compute the length of the curve
    r(t)=<2t,ln(t),t^2> from 1 to 2
    i found r'(t), i just need help finding the square root of (4+1/t^2+4t^2)

    thanks in advance!
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  2. #2
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    4t^2 + \frac{1}{t^2} + 4 =

    \frac{4t^4 + 1 + 4t^2}{t^2} =

    \frac{(2t^2 + 1)^2}{t^2}
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