# Math Help - Deriviative help.

1. ## 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

2. the derivative of ln(5x) is

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