$-7\cdot\left(5\right)-2-\left(-12\right)$
$\left(x+a-11\right)\left(x+a+3\right)$
$\int\left(\frac{x+4}{x^2\left(x^2+4\right)}\right)dx$
$9q-9-q$
$\left(\frac{3}{2}-\frac{x}{4}\right)^2$
$\lim_{x\to1}\left(\left|\arccos\left(\cos\left(x\right)\right)\right|\right)$
$\frac{dy}{dx}=\frac{x^2-1}{y+1}$
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