6. Consider the sequence of functions n²a* – sin(nx) fn(x) = x E (0, 00) n2x (i) Show that fn converges pointwise and determine the limit. (ii) Use the inequality | sin a| < |x\, x eR to show that fn converges uniformly to the above function in (0, 0). (iii) Calculate the limit na4 – sin(nx) lim dx. n 00 /1 n2x Justify any possible exchange of the integral with the limit.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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6. Consider the sequence of functions
n²a4 – sin(nx)
fn(x)
x € (0, 00)
n2x
(i) Show that fn converges pointwise and determine the limit.
(ii) Use the inequality | sin x| < |x], x €R to show that fn converges uniformly to the above function
in (0, 00).
(iii) Calculate the limit
p² nx4 – sin(nx)
lim
dx.
n2x
Justify any possible exchange of the integral with the limit.
Transcribed Image Text:6. Consider the sequence of functions n²a4 – sin(nx) fn(x) x € (0, 00) n2x (i) Show that fn converges pointwise and determine the limit. (ii) Use the inequality | sin x| < |x], x €R to show that fn converges uniformly to the above function in (0, 00). (iii) Calculate the limit p² nx4 – sin(nx) lim dx. n2x Justify any possible exchange of the integral with the limit.
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