$-220+250-200-330+170+140-170$
$3.8-0.25+\left(1.2\right)$
$100x^2-x+9$
$\frac{2h^2}{2h}$
$\cos^2x\:-\:3\sin^2=0$
$f\left(t\right)=\frac{1}{3}\left(\sec^{3}2t-\sec2t\right)$
$2x^2+14x=1$
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