ADV.ENG.MATH (LL) W/WILEYPLUS BUNDLE
10th Edition
ISBN: 9781119809210
Author: Kreyszig
Publisher: WILEY
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(b) Let I[y] be a functional of y(x) defined by
[[y] = √(x²y' + 2xyy' + 2xy + y²) dr,
subject to boundary conditions
y(0) = 0,
y(1) = 1.
State the Euler-Lagrange equation for finding extreme values of I [y] for this prob-
lem. Explain why the function y(x) = x is an extremal, and for this function,
show that I = 2. Without doing further calculations, give the values of I for the
functions y(x) = x² and y(x) = x³.
Please use mathematical induction to prove this
L
sin 2x (1+ cos 3x) dx
59
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