$8-\left[6-\left(-3+7-6\right)\right]+4$
$\int\frac{x}{\sqrt{19+18x-x^2}}dx$
$x-6\le3x+12$
$\frac{6a^4+5a^3-1}{2a^2+a-1}$
$\frac{x^2y}{2x^2}$
$27a^6+8b^9$
$\cos^2\left(x\right)=-\frac{1}{2}$
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