$\frac{x^6+4x^4+4x^2+16}{x^2+4}$
$x^2+10x+25=36$
$\left|-16\right|+2$
$\int a^udu$
$\frac{cscx}{cosx}=tanx+cotx$
$-7-\left(-5\right)$
$2xe^{-x}-x^2e^{-x}$
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