$4a^2b^2-\left(a^2+b^2-c^2\right)^2$
$\frac{dy}{dx}=\frac{y}{2x}+\frac{x}{2y}$
$45\cdot46$
$\left(12x-1\right)\left(2x+7\right)$
$-500\cdot\infty$
$\int\frac{81}{x^2\sqrt{81-x^2}}dx$
$e^{x^2}dy=-xy^3dx$
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