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Math Help - several calculus problems from homework assignment that i couldn't solve II

  1. #1
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    several calculus problems from homework assignment that i couldn't solve II

    3. Let C be the arc of y=8-(x^2)/2 which lies above the x-axis. Find the longest line segment both of whose endpoints lie on C.
    (A) 7.7
    (B) 8
    (C) 8.9
    (D) 9.1
    (E) 12.5

    if you could answer this question, help me please
    Last edited by Ackbeet; April 29th 2011 at 03:21 AM. Reason: Splitting off problem from other thread.
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  2. #2
    MHF Contributor FernandoRevilla's Avatar
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    Compute

    L=\displaystyle\int_{-4}^{\;4}\sqrt {1+(y')^2}\;dx=2\displaystyle\int_{0}^4\sqrt {1+x^2}\;dx=\ldots
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