\ANG{
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K"urze vollst"andig:
\[\frac{9xy^2-6x^2y-6x^2y^2+4x^3y}{24x^3y-81y-16x^4+54x}\]

\medskip

}
\LSG{ $\D\frac{-xy}{4x^2+6x+9}$ }
