7. Suppose neither lim f(x) nor lim g(x) exists. Show that lim[f(x)g(x)) may exist.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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question 7 &8

CL y are funCtIons WIUL G
у аге
then prove that g(x) = - f(x) for all x E R.
7. Suppose neither lim f(x) nor lim g(x) exists. Show that lim[f(x)g(x)| may exist.
8. Prove that lim I =2 using the e-8-definition.
Hint: V- 2 =
I – 4
%3D
%3D
9. Suppose g
that g(x) > 0 for all r E (c- 8, c+ 8).
is a function continuous at c and g(c) > 0. Prove that there exists & >
10. Consider the function
ons2if ¤ E Q
f(x) =
%3D
%3D
1
72
if x ¢ Q.
0:11 vel4
Hint: The fact stated in Question 10 of Problem Set
Prove that f'(0) = 0.
%3D
11., Consider
/Velu
the function f(x) = VI on some closed interval and by applyir
%3D
nhow thot
Transcribed Image Text:CL y are funCtIons WIUL G у аге then prove that g(x) = - f(x) for all x E R. 7. Suppose neither lim f(x) nor lim g(x) exists. Show that lim[f(x)g(x)| may exist. 8. Prove that lim I =2 using the e-8-definition. Hint: V- 2 = I – 4 %3D %3D 9. Suppose g that g(x) > 0 for all r E (c- 8, c+ 8). is a function continuous at c and g(c) > 0. Prove that there exists & > 10. Consider the function ons2if ¤ E Q f(x) = %3D %3D 1 72 if x ¢ Q. 0:11 vel4 Hint: The fact stated in Question 10 of Problem Set Prove that f'(0) = 0. %3D 11., Consider /Velu the function f(x) = VI on some closed interval and by applyir %3D nhow thot
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