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calculus

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Find the derivative of f(x)=[lnx]^4

  • calculus -

    let z = ln x
    dz = dx/x
    dx = x dz
    then
    f(z) = z^4
    df = 4 z^3 dz = 4 z^3 dx/x
    df/dx = (4 /x) (ln x)^3

  • calculus -

    Thank you! I've been stuck on that problem all night.

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