$\frac{dy}{dx}\left(-4x^2y^2-4y^3=2x^3+5x^2y\right)$
$45a^2-7ab+36ab-20^2+8$
$19\cdot15\cdot150$
$\int\frac{\left(x+10\right)^2}{\left(x+100\right)^4}dx$
$6-3+9-5-7+4$
$\left(xy+1\right)^2-\left(x+y\right)^2$
$3a^2\:-8a^2\:-7a^2$
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