$\left(-\frac{1}{2}n^2\right)\cdot\left(-mn\right)$
$2x\left(x+2\right)\left(x^2+x+1\right)$
$\int e^{\cos3x}\sin3xdx$
$7x+18\ge x+6$
$\int\left(\frac{6x^3-5x}{3x^4-5x^2}\right)dx$
$-21=\frac{n}{25}$
$u^2+2uw+w^2$
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