$n\left(n-2\right)\left(n+2\right)=n^3-4n$
$\lim_{x\to0}\left(\frac{ln^{\frac{1}{x}}}{\frac{1}{tanx}}\right)$
$2m-2m+8m$
$\frac{dy}{dv}=y-y^2$
$k^3=27$
$6x^2+x$
$\lim_{x\to3}\left(\frac{x^3+x^2-8x-12}{x^3-4x^2-3x+18}\right)$
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