$6a-2b-22$
$2xy+6xy2+5xy-7xy2$
$1m^2+12mn+4n^2$
$\left(-1.2\cdot3\right)+\left(-10.5+13.1\right)\cdot2$
$17\:-\:6\:+\:4\:-\:12\:+\:3\:-\:4\:-\:9\:+\:8$
$2x-xy-3xy$
$\cos^{-1}\left(\cos\frac{4\pi}{5}\right)$
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