$\lim_{x\to4}\left(\frac{x^2-4}{\sqrt{x}-2}\right)$
$\frac{2x}{5}=-4$
$\int\cot^2\left(x\right)\sec^2\left(x\right)dx$
$a-2a+3a$
$\frac{3-\frac{1}{3x}x}{3\frac{1}{2}}\ge\frac{3x-\frac{5}{2}}{1-\frac{2}{3}}$
$k^2+18k+81$
$\sqrt[3]{x+5}=2$
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