$\frac{-9x^8}{\left(1+x^9\right)^2}$
$3x+9x^2-x+5x^2+4x$
$\lim_{x\to5}\left(\frac{\left(x-5\right)}{x+5}\right)$
$2x^2+4;x=-2$
$\frac{8}{125}y^3-27$
$\left(x^2-0.8\right)\cdot\left(3x^2+1.25\right)$
$\frac{3x^2}{-2x+6}$
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