MathematicalAnalysis Suppose f (x) is defned on (a, b) and continuous at c, where a 0, f (c) < 0, and f (c) = 0 separately.) (b) Is the condition that f is continuous at c necessary in (a)? Justify your answer.

Algebra and Trigonometry (6th Edition)
6th Edition
ISBN:9780134463216
Author:Robert F. Blitzer
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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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MathematicalAnalysis
Suppose f (x) is defned on (a, b) and continuous
at c, where a <c< b.
(a) Prove that if |f | is differentiable at c, then f is
differentiable at c. (Hint: Consider the cases f (c)
> 0, f (c) < 0, and f (c) = 0 separately.)
(b) Is the condition that f is continuous at c
necessary in (a)? Justify your answer.
Transcribed Image Text:MathematicalAnalysis Suppose f (x) is defned on (a, b) and continuous at c, where a <c< b. (a) Prove that if |f | is differentiable at c, then f is differentiable at c. (Hint: Consider the cases f (c) > 0, f (c) < 0, and f (c) = 0 separately.) (b) Is the condition that f is continuous at c necessary in (a)? Justify your answer.
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