$20-2^2-1^3\cdot3$
$\left(3x^a-5y^m\right)\left(sy^m+3x^a\right)$
$\left(a-b\right)\left(a^3-a^2b+ab^2-b^3\right)$
$sin^2\left(\theta\right)+2\:cos\left(\theta\right)=\:-2$
$x^2-9x+18=0$
$\left|\left(3a-4b\right)\left(a+b\right)\right|-\left|\left(a+2b\right)\left(a-b\right)\right|$
$\frac{a^5bc}{a^4b^3}$
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