$-r^2+5r-6$
$2\left(x\:-\:9\right)$
$x\left(x+1\right)\left(x+2\right)\left(x-1\right)-24$
$\left(3m^3+5m^2\right).\left(2-3m\right)$
$\sqrt{1.5}$
$c^2-6cd+9d^2$
$dy=e^{2x+3y}dx$
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