$x^4+4x^2-21$
$\left(\left(x+6\right)\left(x+3\right)\left(x+7\right)\right)$
$36+-1$
$-8x+7<31$
$\int\frac{2}{\sqrt{4x^2+9}}dx$
$\int\left(\pi^2-x^2\right)\cdot\sin\left(x\right)dx$
$\frac{2x^2-3}{x+4}$
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