$\sqrt{5x^2}\sqrt{40x}$
$\left(82-x\right)^2$
$5\cdot\left(4+4\right)$
$cot5sin5$
$23+\:13s+\:8k+\:-\:5s\:\:-\:2k\:\:-2$
$7cos\left(5x\right)+9=12$
$\lim_{x\to3}\left(\frac{\sqrt{2+x}-\sqrt{2}}{x}\right)$
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