$\lim_{x\to0}\left(\frac{\sqrt[3]{x+2}-\sqrt[3]{2}}{\sqrt{x+2}-\sqrt{2}}\right)$
$\cot^2\left(a\right)=\cos^2\left(a\right)+\cot^2\left(a\right)$
$2a^{2\:-50}$
$64\cdot4+1$
$-3^3-3i$
$a-b=2$
$-10.62-17.5$
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