$\frac{x^4+2}{x^2+5x+2}$
$\frac{d}{dx}x^{-4}+20$
$\int\left(\frac{2x-1}{x^2-2x+1}\right)dx$
$x^2+6x+1-3x^2-5x+2-4x^2-6x-1$
$y=3^{2x+1}$
$4x^2-12x+96$
$adb-b^2da=0$
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