(a) Using the formal definition of a limit, prove that f(x) = x³ - 2x is continuous at the point x = 1; that is, limx→1 (x³ - 2x) = = -1. (b) Draw a mapping diagram to illustrate your answer to (a) for the special case of € = = 1/2. (c) (i) Prove that: 77 ㅠ | sin (3x + 3x -|- 0.005 (ii) Using (i) prove that if x is within of, then sin(3x + 2) is approximately 0 correct to 2 decimal places. 3

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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(a) Using the formal definition of a limit, prove that
f(x) = x³ - 2x
is continuous at the point x
=
1; that is, lim ₁ (x³ — 2x) =
= -1.
(b) Draw a mapping diagram to illustrate your answer to (a) for the
special case of € =
= 1/2.
(c)
(i) Prove that:
77
ㅠ
| sin (3x + 3x -|-
0.005
(ii) Using (i) prove that if x is within of, then sin(3x + 2) is
approximately 0 correct to 2 decimal places.
3
Transcribed Image Text:(a) Using the formal definition of a limit, prove that f(x) = x³ - 2x is continuous at the point x = 1; that is, lim ₁ (x³ — 2x) = = -1. (b) Draw a mapping diagram to illustrate your answer to (a) for the special case of € = = 1/2. (c) (i) Prove that: 77 ㅠ | sin (3x + 3x -|- 0.005 (ii) Using (i) prove that if x is within of, then sin(3x + 2) is approximately 0 correct to 2 decimal places. 3
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