$\frac{dy}{dx}=\frac{2y}{1-x^2}$
$8x^5+12x^3+20x^2$
$-81m^4-25a^2b^9$
$\frac{6x-48}{5x^2-320}$
$\lim_{x\to0}\left(\frac{5^x-1}{x^{5^x}}\right)$
$x^2-y^2\:+\:2x^2-3y$
$\int3^{2x}\:dx$
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