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Hallo! pi=integral[sqrt(1-x^2),-1,1]*2 Kann man von sqrt(1-x^2) eine Stammfunktion bilden?
http://de.wikipedia.org/wiki/Integration_durch_Substitution#Beispiel_3
(Beispiel 3)
ja, kann man.
1/2 (x Sqrt[1-x^2]+ArcSin[x])