PhotoMath AI Expert
Advanced math solver built for university, research, and tutors.
Expert mode goes beyond plain answers , full proofs, theorem citations, edge case warnings, and clean LaTeX export. Trusted by graduate students and instructors who can't afford to be wrong.
If f is continuous on [a,b] and differentiable on (a,b), then ∃ c ∈ (a,b) such that f'(c) = (f(b)−f(a))/(b−a).
Let g(x) = f(x) − ((f(b)−f(a))/(b−a))·(x−a).
Note g(a) = f(a) and g(b) = f(a).
By Rolle's theorem, ∃ c ∈ (a,b) with g'(c) = 0.
⟹ f'(c) = (f(b)−f(a))/(b−a). ∎
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