$\frac{2x^3-4^2-15x+5}{x^2-2x-8}$
$z^2-18z=-41$
$\left(6a+6b^2-5c\right)^2$
$\lim_{x\to3}\left(\frac{2x^2-3x-9}{x-3}\right)$
$y'=16+4x-9x^2$
$c\left(x\right)=0.004x^2+5\left(2000\right)+600$
$\frac{q}{2}<28$
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