$x\left(x^3+y\right)$
$\int\left(\frac{w}{w^2+9}\right)dw$
$6\tan x+12\cot x$
$9z\:+\:2z\:-8$
$-16\left(-8\right)+\left(-7\right)+\left(-20\right)$
$c2+c$
$11\left(-2\right)\cdot5$
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