f''(x) = x;
f'(x) = 1/2 * x^2 + c;
f'(0) = 2; (la costante c deve valere 2);
f'(x) = 1/2 x^2 + 2
f(x) = 1/2 * (x^3 / 3) + 2 x + c = x^3 / 6 + 2 x + c;
f(0) = 1; (la costante c deve valere 1)
f(x) = x^3 / 6 + 2 x + 1.
Ciao @alby
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