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Math Help - Volume of solid of revolution

  1. #1
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    The region under the graph y=1/2(e^x + e^-x) and between the lines x=-2 and x=2 is rotated about the x-axis. Find the volume of the revolution formed.

    Ive got the answer to 49.106. However it is different to the book by about 2 decimla places. I am wondering if i am wrong or what?
    Last edited by mr fantastic; September 7th 2009 at 04:33 AM. Reason: Moved from another thread
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  2. #2
    MHF Contributor Calculus26's Avatar
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    by the way 1/2(e^x +e^-x) is also known as cosh(x)

    I get 49.15

    Without seeing your work I can't tell where the discrepancy might be.
    I would guess you may have rounded in the evaluation as you went instead of waiting until the very end to round your result?
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