$\lim_{x\to2}\left(\frac{x^2+5x-14}{\sqrt{8-x^2-x}}\right)$
$208.18\cdot5$
$\frac{\tan a-\cot a}{\tan a+\cot a}$
$-b^2=4b-20$
$\lim_{y\to0}\left(\frac{y^2-3y}{y^2+4y+3}\right)$
$\cos\left(5x\right)=\frac{1}{2}$
$\frac{1}{2+4x}$
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