Input:
d(f(x)/g(x))
Write:
`d(f(x)/g(x))`
Output:
$$\frac{d}{dx} \frac {f(x)}{g(x)}== (-\frac{d}{dx} g(x))\ f(x)\ \frac{1}{g(x)^2}+\frac {\frac{d}{dx} f(x)}{g(x)}$$
Result: $$(-\frac{d}{dx} g(x))\ f(x)\ \frac{1}{g(x)^2}+\frac {\frac{d}{dx} f(x)}{g(x)}$$
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