$\lim_{x\to-4}\left(x^2+6x+8\right)$
$\left(cos^2x-1\right)^3$
$81x^{2}+198x+121$
$\sqrt{2500}$
$\frac{49x^6-98x^5+49x^4}{49x^5-49x^3}$
$m^3-m^2-4m+4$
$x^22^x-2^x=0$
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