$\frac{4x^2+27x+31}{x+5}$
$3x+4=x+6$
$\frac{d}{dx}\left(2^{tan^2x}\right)$
$^{x^3}+2<2$
$4x+2y+9+6x+2$
$\lim_{x\to2}\left(\frac{x^2+4x-4}{x^3-12x+16}\right)$
$\frac{6}{\left(2x+1\right)^2}$
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