$x^4-4x^3-13x^2+4x+12$
$\:b^2+5b-2bc+c^2$
$66.01\cdot36.86$
$\left|\left(7\right)\left(4\right)\right|\left(2\right)$
$\frac{dy}{dx}=\frac{x-y}{x+2y}$
$19-\frac{20}{4}$
$\int\frac{x^3+x^2+x+2}{x^4+x^2}dx$
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