$\lim_{x\to0}\left(\sin\left(\frac{x}{2}\right)\right)^2$
$x^2>8-2x$
$\ln\left(\frac{1-x}{e}\right)$
$cos^212-sin^212$
$-5c-6c$
$-3+7+1-4+5-12+9$
$3x^2-18x+12=0$
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