$\int\frac{x^3-3x^2+3x-7}{\left(x^2-4\right)\left(2x-5\right)}dx$
$y=7x^2-98x+343$
$\lim_{x\to1}\left(\frac{\left(x+1\right)^{-1}-\left(2x\right)^{-1}}{x-1}\right)$
$\frac{d}{dx}\cot\left(10x^8\right)$
$\frac{ab+a}{4a}$
$\frac{dy}{dx}=x-1+yx-y$
$\left(3x+y\right)^2$
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