Spiegare il ragionamento e argomentare.
L = S_[L] F*dr = S_[0,1] (3x - 1)^2 dx = 1/3 S_[0,1] (3x - 1)^2*3 dx =
= 1/3 * 1/3 [(3x -1)^3]_[0,1] = 1/9 * [(3-1)^3 - (0-1)^3] = (8 + 1)/9 J = 1 J
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