$\lim_{x\to-3}\left(\:\sqrt{2x^2+3x}\:\right)$
$4\tan x-1=\tan x+2$
$2x-15>19$
$11r\:-\:7r\:+\:11r$
$2x^4-2yx^2$
$-17+\sqrt{2.6}$
$\left(12x^2-1\right)\left(12x^2+1\right)$
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