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Math Help - Deriviative help.

  1. #1
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    Deriviative help.

    f(x)=sinxln5x
    using product rule I got cosx(ln5x)+(sinx)/5x but the answer in the back says cosx(ln5x)+sinx/x
    where did i go wrong
    Last edited by mr fantastic; October 6th 2010 at 01:30 PM. Reason: Edited title.
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  2. #2
    MHF Contributor harish21's Avatar
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    the derivative of ln(5x) is

     \frac{1}{5x} \times \mbox{the derivative of 5x} = \frac{1}{5x} \times 5= \frac{1}{x}
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