# Math Help - Derivative

1. ## Derivative

can anyone help me with this Derivatibe $y=(x^n)/(n!)$
from my high school i learned you use log or ln to bring the n down...but in this course they hasnt taught this yet...they only taught simple derivatives...and for n! i have no idea wht is its derivative:S

2. Because $\displaystyle n!$ is constant then $\displaystyle y=\frac{x^n}{n!}\implies \frac{dy}{dx} = \frac{nx^{n-1}}{n!}=\frac{x^{n-1}}{(n-1)!}$