$\lim_{x\to\infty}\left(\frac{1}{x^2}-2\arctan\left(\frac{1}{x}\right)\right).x$
$x\left(3\right)+7x\left(2\right)+15x+9$
$m^{12}+x^{18}$
$\frac{36x}{55y}\cdot\frac{33y^2}{40x}$
$2a^2-3a+2$
$\:\left(-176\right)\:-\:\left(-159\right)\:$
$-\left(x-x^2\right)-2\left(5-x\right)+7$
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