Proof of the Mean Value Theorem for integrals

2026-05-05 11:50

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Proof of the Mean Value Theorem for integrals

Recall: Mean Value Theorem
If the function f is continuous on the closed interval [a,b] and differentiable on the open interval (a,b), there exists a value c on [a,b] such that:

f′(c)=f(b)−f(a)b−a

Then:

f′(c)(b−a)=f(b)−f(a)

Recall: Definition of the area under a curve using Riemann Sums
If a function f is continuous on the closed interval [a,b], then the area under the curve wrt to the x-axis is

limn→∞∑i=1nf(xi)ΔxΔx=b−an , xi∈[i,i−1]f(b)−f(a)=limn→∞∑i=1n[f(xi)−f(xi−1)] , x0=a

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