$\lim_{x\to\infty}\left(13xe^{-3x}\right)$
$2x^3\sqrt{\frac{1}{4x^2}}$
$\left(7^2\right)^5$
$18y-36$
$m^2-41+400$
$\left(b^3+1-5b^2\right)-\left(3b^3-2-8b^2\right)$
$\int_{-\pi}^x\sin\left(x\right)dx$
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