(2xy+3x^2-ye^(xy))dx+(x^2-xe^(xy)+8y)dy/Geschlossen und exakt/Aufgabe

\omega =(2xy+3x^{2}-ye^{xy})dx+(x^{2}-xe^{xy}+8y)dy

auf dem ${}\mathbb {R} ^{2}$ geschlossen und auch exakt

ist.

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