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Undersøg arealfunktionen A(x) for f(x)
Klikbevis for at A'(x)=f(x)
Klikbevis for at arealet under grafen for f, mellem x=a og x=b kan beregnes af F(b)-F(a)
1. Arealfunktionen
2. Klikbevis: Arealfunktionen er en stamfunktion til f(x) eller A'(x)=f(x)
3. Klikbevis: Areal under graf kan beregnes som F(b)-F(a)