całka z xe do potegi -x do kwadratu
podstawiasz t = -x^2
czyli dt = -2xdx
xdx = dt/-2
całka z xe^(-x^2) = -1/2 całka z e^t = -1/2 e^t = -1/2 e ^(-x^2)
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podstawiasz t = -x^2
czyli dt = -2xdx
xdx = dt/-2
całka z xe^(-x^2) = -1/2 całka z e^t = -1/2 e^t = -1/2 e ^(-x^2)