Prove and show complete solution: Let ƒ be defined on an open interval (a, b) and assume that ƒ has a local maximum or a local minimum at an interior point e of (a, b). If ƒ has a derivative (finite or infinite) at c, then f'(c) must be 0.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section4.5: Rational Functions
Problem 51E
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Prove and show complete solution:
Let f be defined on an open interval (a, b) and assume that f has a local maximum or
a local minimum at an interior point c of (a,b). If ƒ has a derivative (finite or infinite)
at c, then f'(c) must be 0.
Transcribed Image Text:Prove and show complete solution: Let f be defined on an open interval (a, b) and assume that f has a local maximum or a local minimum at an interior point c of (a,b). If ƒ has a derivative (finite or infinite) at c, then f'(c) must be 0.
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