$9x^2-80-100$
$3x^2+4x+4=3$
$\left(7x+3x^2\right)^2$
$\frac{b}{3}=2$
$\left(1+\tan x\right)^2-\left(1-\tan x\right)^2$
$166\cdot\frac{1}{2}$
$\lim_{x\to-\infty}\left(\frac{3x^2}{2x+3}\right)$
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