$2x+9x^2\le50$
$\frac{dy}{dx}\left(x^2+4xy+y^2+13\:=\:0\right)$
$3+9x-4$
$4x^2+8x+5=0$
$-3x^2\cdot4$
$3\sqrt{4x+7}5-8x$
$\int\frac{x^2-2x-3}{x^3-x^2+2}dx$
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