$\lim_{x\to-\infty}\frac{x^3}{e^{x^2}}$
$4x^4-9y^2z^2$
$n^2+20n+100$
$16x+x^2=0$
$x^2+10+1$
$-15\:-9\:+\:2\:+\:-\:13$
$\left(\sin\left(x\right)-1\right)\left(\cos\left(x\right)-1\right)=0$
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