$\left(x^2-1\right)y''+4xy'+2y$
$15abc^2+45a^2bc$
$\lim_{x\to\infty}\left(9x^2e^{-x}\right)$
$-18\left(12+13\right)$
$\int\frac{x}{x+200}dx$
$\frac{4x^2+7x-2}{x+2}$
$-5x+x$
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