Recall the following Quotient Rule:
d d x ( h ( x ) g ( x ) ) = g ( x ) ⋅ d d x ( h ( x ) ) − h ( x ) ⋅ d d x ( g ( x ) ) ( g ( x ) ) 2 . {\displaystyle {\frac {d}{dx}}\left({\frac {h(x)}{g(x)}}\right)={\frac {g(x)\cdot {\frac {d}{dx}}(h(x))-h(x)\cdot {\frac {d}{dx}}(g(x))}{(g(x))^{2}}}.}
