$2cot\:2x=5$
$\int\left(\frac{2x+1}{x^2+2x+2}\right)dx$
$3+7x<12-5x$
$cot\left(-x\right)$
$\frac{x^2-3}{1+x}$
$x^2+24x+114$
$\lim_{x\to\infty}\frac{e^{2x-9}}{3x}$
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