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Math Help - Mean curvature of a surface (just stuck with some simplifying!)

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    Mean curvature of a surface (just stuck with some simplifying!)

    Hi everyone, new here and trying to calculate the mean curvature for the following surface:

    r(u,v)=ui+f(u)cos(v)j+f(u)sin(v)k


    I have been through the process of finding tangent vectors and a unit normal vector to the surface, so up to the point where I have had to substitute 6 scalars into:

    h(p)=
    aG-2bF-cE
    2(EG-F2)

    The only problem I seem to be having is not being able to simplify it... This is what I have:

    h(p)=
    f''(u)f(u)2-f'(u)2-1
    2f(u)(1+f'(u)2)√(cos2(2v)f'(u)+1)

    Maybe missing something really simple here or I have made a mistake in calculating the scalars.

    Any help, much appreciated!

    (I have reposted this in University Maths - geometry, as it's in the wrong place.. any hints on how to delete this one though?)
    Last edited by susie9393; February 1st 2013 at 07:06 AM.
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