$\lim_{x\to0}\left(\frac{\sqrt[3]{x^2}-2\sqrt[3]{x}-1}{\left(x-1\right)^2}\right)$
$3\tan^2x+11\tan x=4$
$9.756-8.27-10.322$
$64x^2-1$
$\lim_{x\to5}\left(\frac{x-4}{\sqrt{x+21}-5}\right)$
$31.23797\cdot10$
$x^2+18x+21$
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