$\int\frac{\cot^2\left(x\right)}{\csc\left(x\right)}dx$
$\lim_{x\to1}\left(\frac{x^2-1}{x^2mas\:3x\:mas\:2}\right)$
$123\left(5\right)$
$\left(am+bn\right)\left(am-bn\right)$
$\left(4^6\right)^3$
$27-35+16$
$3x-5>20$
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