Så langt henger jeg med fasiten:Use the Divergence Theorem [] to calculate the flux of the given vector field out of the sphere S with equation , where .
Men i følge fasiten er:
Mitt spørsmål er: Hvordan kommer man fra

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Så langt henger jeg med fasiten:Use the Divergence Theorem [] to calculate the flux of the given vector field out of the sphere S with equation , where .