$\:\left(-21\right)\left(-43\right)$
$\left(x-2\right)\left(x+2\right)\left(x^2-4\right)$
$\lim_{x\to\infty}\left(lnx-\sqrt{x}\right)$
$\left(x^{a}y\right)^{3}$
$3\tan^2x+11\tan x=4$
$\frac{3x+2x-5}{5}$
$\lim_{x\to1}\left(ln\:x^2\right)^{x-1}$
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