$x^2e^-x$
$6^{10}.6^8.6$
$18x+5y=-11$
$sin\left(x+\frac{\pi}{4}\right)+sin\left(x-\frac{\pi}{4}\right)$
$2g^2+5g+2$
$\frac{\tan45^{\circ}}{30^{\circ}+\tan}$
$3\left(c+7\right)$
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