$3x^2-x+4=0$
$x^9+x^8$
$\lim_{x\to9}\left(5\right)$
$\frac{1-2\cos^2x}{\sin x\cos x}$
$\sqrt{0}+5$
$9r^2-12r+4$
$\left(10m+15y\right)^2$
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