$\frac{x^3}{x^2-9}$
$\int\left(\frac{4x^2}{2}\right)dx$
$21x^2y^2+28x^2y-7xy$
$\int\left(\frac{8}{x+5}\right)dx$
$3k^2+k+5=0$
$b^2+9b+20$
$6x^2-8x+1$
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