$100x^2+26x$
$\frac{3x^2}{\left(1-x\right)^2}$
$xy'+y=\left(x+1\right)^2;\:y\left(1\right)=2$
$\frac{x^9+a^9}{x+a}$
$\frac{s^0t^0u^{-8}\cdot s^7tu^{-1}}{s^2t^{-4}u^{-4}}$
$\frac{1}{x^2+x-2}$
$\frac{d}{dx}\frac{x^2+2}{x^4-4x^2+3}$
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