$-\frac{21}{-7}$
$\left(\frac{\left(x-4\right)}{\sqrt{x}-2}\right)$
$\frac{d}{dx}x-y=xy^3+y^4$
$x+1<2$
$\frac{d}{dx}\left(20x^{ln20x}\right)$
$\int\cot\left(-\frac{1}{3}x\right)dx$
$\lim_{x\to4}\left(\frac{\left(-9x^2+38x-8\right)}{x-4}\right)$
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