$\lim_{x\to-1}2\pi$
$12a-3b^2$
$\int\frac{x^4}{\left(x^5-1\right)^6}dx$
$2x+2=14$
$7\cdot5-17\cdot2$
$\lim_{x\to-2}\left(\frac{\sqrt{x+6}-2}{s+2}\right)$
$\frac{3+x}{3-x}>1$
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