$\int x\:\cdot e\left(\frac{\left(-x^2\right)}{2t}\right)dx$
$\cot b=\frac{14}{11}$
$a-a-b+a^2+5b$
$-\:2\:-7-9+5-1+8-7-3$
$10x-y=30$
$60^4$
$\lim_{x\to0}\left(1+\frac{1}{x}\right)^{3x}$
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