$\frac{4x^3-2x^2+1}{4x^3-x}$
$\frac{1}{\frac{x-1}{x+1}}$
$\frac{5x^2-5}{x+2}=x-2$
$4\:x\:10^2$
$\left(a^4+a^3-a^2+a-3\right)\left(a+2\right)$
$\lim_{x\to2}\left(x^3+2x^2-x-4\right)$
$\frac{dy}{dx}=4e^{-.8x}-.5y$
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