$xy\sqrt{18x^2}y^2$
$-5x^2+3x+2$
$2x^2-72$
$\left(1-\cot a^2\right)$
$\lim_{x\to-2}\left(\frac{\sqrt{x+1}-2}{x-3}\right)$
$\sec^2\left(x\right)-1-\frac{1}{cot^2x}=0$
$-\left(\frac{-70}{10}\right)$
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