(a) What does it mean for f to be differentiable at a?(b) What is the relation between the differentiability andcontinuity of a function? (c) Sketch the graph of a function that is continuous but notdifferentiable at a=2 .

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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(a) What does it mean for f to be differentiable at a?
(b) What is the relation between the differentiability and
continuity of a function?

(c) Sketch the graph of a function that is continuous but not
differentiable at a=2 .

Expert Solution
Step 1

(a) Let f(x) be a function which is differentiable at a point x=a.It means that the function is continous at x=a and it's derivative exists at x=a i.e., df(x)dxx=a=f'(a) exists.Formula to calculate f'(a)=limh0f(a+h)-f(a)h.

Step 2

(b) If a function is differentiable in it's domain it means that function is continous also in it's domain.But if a function is continous at a point or in some interval then it doesn't means that function is differentiable at that point or interval, it may be differentiable or may not be.A continous function is differentiable if it's derivative exists throughout it's entire domain.

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