$\frac{x^2y^{-5}}{x^{-8}y^{-8}}$
$\left(x^2-2x+1\right)\left(2x+1\right)$
$2x^3-x^2-2x+1$
$\left(1+10x+\:10y\right)+\left(100x+90y\right)$
$\lim_{x\to\infty}\left(\frac{2x^2+3x+8}{4x^3-8x+1}\right)^2$
$\left(-204\right)-\left(-205\right)$
$series\:$
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