$\frac{d}{dx}e^x+x$
$\lim_{x\to\frac{\pi}{2}}\left(\left(\pi-2x\right)secx\right)$
$\left(-5\right):5+10\:x\:\left(-3\right)\:$
$\left(-2m^3\right)-m^2+3^2$
$7m\:+8n\:-\:5m\:\:-10n$
$6\cdot i^2+36$
$x^4+22x^2+121$
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