$ab^2=5$
$18\::\:-9$
$-12mn\:+\:2m$
$\left(3n+2b\right)\left(3n-2b\right)$
$e^x\cdot e$
$\left(-1\right)\cdot\left(-2\right)\cdot\left(-3\right)\cdot\left(-7\right)$
$3\cos^2+2\sin^2=3$
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