$\left(-127\right)+\left(38\right)$
$rs+4s$
$\sqrt{\left(3+\sqrt{2}\right)}\cdot\sqrt{\left(3-\sqrt{2}\right)}$
$\frac{3^{-2}}{3^0}$
$\int\frac{2x^3-9x^2-56x+195}{x^3-10x^2+17x+28}dx$
$\lim_{x\to0}\left(\frac{1-\cos\left(x\right)\left(\sec\left(2x\right)\right)}{3x^3\csc\left(x\right)}\right)$
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