$\frac{81-x^4}{9-x^2}$
$\frac{2x^3-\:5x\:\:+\:3}{x-1}$
$-x^2y+8x^2y$
$x^2+40x+25$
$\frac{\frac{2}{\sqrt{2h+9}}-\frac{2}{3}}{h}$
$\frac{dy}{dx}=e^{-3x\:+\:2y}$
$\left(02-2x\right)^2$
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