$\lim_{x\to0}\left(\frac{x^2-5x+4}{x^2-3x-4}\right)$
$\left(4a^2\right)\left(4-a^2\right)$
$\left(cotx+cscx\right)\left(tanx-senx\right)=tanx\cdot\:\:senx$
$\left(n+3\right)\left(n+5\right)\left(mn+n^2\right)$
$\frac{-\sqrt{3}+4}{\sqrt{3}-4}$
$\sqrt{2018\cdot2024+9}$
$a^2-30ad$
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