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Math Help - please help determine the 2nd derivative

  1. #1
    Junior Member
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    please help determine the 2nd derivative

    y=ln cos x
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  2. #2
    Junior Member
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    Nov 2009
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    use: h(x) = g(f(x))
    h'(x) = g'(f(x)) * f '(x)

    here f(x) = cos(x)
    g(f(x)) = ln (cos(x))
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