$-x^2\leq 0$
$\left(x^3\right)^3-4^3$
$1-x^4y^2$
$z=x+yi$
$8^2-16$
$12w^2-5w\:+20$
$\frac{4x^2-13x+9}{x-\:1\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:}$
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