$7ab-11ab+20ab-31ab$
$\lim_{x\to0}\left(x^2\cos\left(\frac{1}{x}\right)\right)$
$\left(\frac{2}{3x}+\frac{3x}{2}\right)^2$
$3^2-9x$
$x^2\left(x^2-2x+2\right)$
$8\sin^2x+2\sin x-3=0$
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