$\left(6x+1\right)\cdot\left(6x-1\right)$
$\lim_{x\to\infty}\left(\frac{2e^x}{1+e^x}\right)$
$\int dm$
$\left(3y^2+x\right)^2$
$y=\left(x-\frac{1}{3}\right)^2$
$\lim_{x\to2}\left(16-4x^2\right)$
$mn^{-3}+2mn^3-mn^3+mn^{-3}$
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