$\frac{6x^4+23x^2+4x+15}{x^2+3}$
$9 ( 5 v - 3 ) + 4 ( 2 v + 5 )$
$\left(x+2\right)\left(\:+3\right)$
$\lim_{x\to0}\left(\frac{sin6x}{sin2x}\right)$
$\frac{x^4-x^2-3x+2}{x-1}$
$\frac{\left(\frac{1}{x+5}\right)}{\left(\frac{9x}{x+5}\right)}$
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