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; Oct 6th 2010 at 12:30 PM. Reason: Edited title.
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the derivative of ln(5x) is $\displaystyle \frac{1}{5x} \times \mbox{the derivative of 5x} = \frac{1}{5x} \times 5= \frac{1}{x}$
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