$\left(-3x+6i\right)\left(x+2i\right)$
$\frac{x^5+x^2-9}{x+1}$
$\lim_{x\to\infty}\left(\frac{3}{x^2+1}\right)$
$-763\:+\:-712$
$cos^2x\:cot^2x\:+cos^{2x}$
$\frac{d^{23}}{dx^{23}}\frac{1}{x}$
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