Show that -2 2 x [** | sin(na)ƒ(x)\dx = } 7T lim ∞0++u -2 = ²* \f(x) dx for any ƒ € L¹ (0,2m). 0

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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3. Show that
2T
2T
2
lim
n++∞0
= 2* | sin(nx)f(x)|dx = ** |ƒ(x)\dr for any ƒ € L¹(0,2r).
ㅠ
(Hint: consider first the case where f is the characteristic function of an interval.)
Transcribed Image Text:3. Show that 2T 2T 2 lim n++∞0 = 2* | sin(nx)f(x)|dx = ** |ƒ(x)\dr for any ƒ € L¹(0,2r). ㅠ (Hint: consider first the case where f is the characteristic function of an interval.)
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