$50r^2-32r^2$
$-5,3+2,61$
$\left(9c^{10}-7d^5\right)\left(9c^{10}+7d^5\right)$
$\lim_{x\to5}\left(\frac{x+3}{2x}\right)^{\frac{x+3}{x}}$
$2x^2+12xy+18y^2$
$\sqrt[3]{81x^2y^4}$
$\int_{-\infty}^1\left(e^{-2x}\right)dx$
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