Exercise 8.5.9. Use the previous identity to show that sin ((N + 1)) sin () 1/2+ D1(0) + D2(0) + -.· + DN(6) 1 ... N +1 2(N + 1)

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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The expression in Exercise 8.5.9 is called the Fej´er kernel and will be denoted
by FN(θ). Analogous to the Dirichlet kernel DN(θ) from the proof of
Theorem 8.5.3, FN is used to greatly simplify the formula for σN(x).

Exercise 8.5.9. Use the previous identity to show that
sin ((N + 1))
sin ()
1/2+ D1(0) + D2(0) + -.· + DN(6)
1
...
N +1
2(N + 1)
Transcribed Image Text:Exercise 8.5.9. Use the previous identity to show that sin ((N + 1)) sin () 1/2+ D1(0) + D2(0) + -.· + DN(6) 1 ... N +1 2(N + 1)
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