$t^2\frac{dy}{dt}-ty=0$
$\lim_{x\to\infty}\left(2+e\left(x\right)\right)e^{-x}$
$\left(-m^3n^3x\right)\left(mn^2y^2\right)$
$\int\frac{x^4}{\sqrt[3]{5+x^5}}dx$
$\left(2a-b^2+3\right)^2$
$\frac{x^4-3x^2+2}{x-1}$
$196 b ^ { 2 } - 121$
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