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Input:
`d(f(x)/g(x))`

Compute: $$\frac{d}{dx} \frac {f(x)}{g(x)}$$

Result:
$$(-\frac{d}{dx} g(x))\ f(x)\ (g(x)^{-2})+\frac{d}{dx} f(x)\ \frac{1}{g(x)}$$

$$\frac{d}{dx} \frac {f(x)}{g(x)} == (-\frac{d}{dx} g(x))\ f(x)\ (g(x)^{-2})+\frac{d}{dx} f(x)\ \frac{1}{g(x)}$$




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