$2x^2y+x^3y=1$
$\frac{34.9857}{2}$
$x^2-16x-5$
$2y\left(-3y-a\right)$
$\:4\left(8n+2\right)+5n$
$\left(\frac{1}{2}-3k\right)^2$
$cot\left(45\right)-tan\left(45\right)$
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