il
teorema fondamentale del calcolo
: f(b) - f(a) =
a
∫
b
f'(x) dx .
f(b) - f(a) = Σ
k=0..n-1
{ [ f(x
k
+Δx)-f(x
k
) ]/Δx } Δx = Σ
k=0..n-1
f'(ξ
k
)Δx , con x
k
< ξ
k
< x
k+1
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