$3+2a+18a+1$
$144n^2-9a^2$
$\lim_{x\to infinity}\left(2x-lnx\right)$
$\left(+23\right)-\left(-25\right)$
$\left(a^{n-1}+b^{nm-1}\right)\left(a^{n-1}-b^{nm-1}\right)$
$\int\left(\frac{1}{w\sqrt{w+1}}\right)dw$
$\frac{n}{-2}>4$
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