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Math Help - Length of the curve using chain rule

  1. #1
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    Length of the curve using chain rule

    y=ln(secx) for x between 0 and pi/4.

    I've taken the first derivative but then what?
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  2. #2
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    Hi there Scottfranklin,

    now

     L=\int_0^{\frac{\pi}{4}} \sqrt{1+f'(x)^2}~dx
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