12. Consider the eigenvalue problem y" + ìy = 0; y(-n)= y(1), y'(-x) = y'(1), which is not of the type in (10) because the two endpoint conditions are not "separated" between the two endpoints. (a) Show that 2o = 0 is an eigenvalue with associated eigenfunction yo(x) = 1. (b) Show that there are no neg- ative eigenvalues. (c) Show that the nth positive eigen- value is n2 and that it has two linearly independent associ- ated eigenfunctions, cos nx and sin nx.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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12. Consider the eigenvalue problem
y" + 1y = 0; y(-n)= y(n),
y'(-x) = y'(1),
%3D
which is not of the type in (10) because the two endpoint
conditions are not "separated" between the two endpoints.
(a) Show that 2o = 0 is an eigenvalue with associated
eigenfunction yo(x) = 1. (b) Show that there are no neg-
ative eigenvalues. (c) Show that the nth positive eigen-
value is n2 and that it has two linearly independent associ-
ated eigenfunctions, ços nx and sin nx.
%3|
Transcribed Image Text:12. Consider the eigenvalue problem y" + 1y = 0; y(-n)= y(n), y'(-x) = y'(1), %3D which is not of the type in (10) because the two endpoint conditions are not "separated" between the two endpoints. (a) Show that 2o = 0 is an eigenvalue with associated eigenfunction yo(x) = 1. (b) Show that there are no neg- ative eigenvalues. (c) Show that the nth positive eigen- value is n2 and that it has two linearly independent associ- ated eigenfunctions, ços nx and sin nx. %3|
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