$2b^{-4}\:a^{-1}b^3$
$3x^3\cdot\left(x-2x^2-4\right)$
$37-4\cdot8+5^2$
$\left(2w^4-8r^4\right)^2$
$\arctan\left(x\right)=0$
$g2-49$
$6x+9<63$
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