$\int\frac{-x^2+4x}{x\left(x^2+2\right)}dx$
$9.\sqrt{ab}$
$x^2+2x+28$
$\int9\sqrt{x}\ln\left(x\right)dx$
$\lim_{x\to-3}\left(\frac{x^2+6x+9}{x^2+7x+12}\right)$
$\lim_{x\to-9}\left(\frac{4x}{x+5}\right)$
$-23f\:-\:21\:=\:-5\left(5f\:+\:5\right)$
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