$11+-9+20+-3+-12+-1$
$\left(-x-y\right)\left(-3x+y\right)$
$\left(5mn^4a\right)\left(-2m^3n\right)$
$\left(\frac{1}{sinx\:cot\:x}\right)=\left(\frac{1}{cos\:x}\right)$
$x^2-55x+254$
$\left(5x^3-3x^5\right)^5$
$a^3b-a^2b^2+ab^3-b^5$
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