$tan\left(\pi-x\right)$
$\frac{27xy^2}{36xz}$
$-x^2-4x+8\:<\:0$
$-25y^2-50y$
$-2054-365$
$1500\le\frac{1500-450x}{8}$
$\left(z+1\right)\left(z^2+1\right)$
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