$3a^2-3a-6$
$x+6\le14$
$\tan^2x-\cot^2y=\sec^2y-\csc^2y$
$\lim_{r\to\infty}\left(\frac{\sin\left(r^2\cos^2+r^2\right)}{r^2}\right)$
$\int x\left(4x-\frac{2}{x}\right)dx$
$x'=\left(2+x\right)\left(9+t\right)$
$-3500+\left[-2020\right]$
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