$x^6+20x^4-x^2$
$\int_{-2}^12xdx$
$\left(6ab\right)^2$
$2\cdot112.5$
$2^x+2^{x+2}=20$
$x^2-5x-14\le0$
$\sec+\tan=\frac{\cos}{1+\sin}$
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