Use a Fourier cosine expansion to solve

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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**Problem Statement**

Use a **Fourier cosine expansion** to solve the following problem:

Given the partial differential equation:

\[
\frac{\partial u}{\partial t} - \frac{\partial^2 u}{\partial x^2} = t \cos \pi x \quad \text{in} \quad (0,1) \times (0,+\infty),
\]

with the boundary conditions:

\[
\frac{\partial u}{\partial x}(0, t) = \frac{\partial u}{\partial x}(1, t) = 0, \quad t > 0,
\]

and the initial condition:

\[
u(x,0) = x, \quad 0 < x < 1.
\]
Transcribed Image Text:**Problem Statement** Use a **Fourier cosine expansion** to solve the following problem: Given the partial differential equation: \[ \frac{\partial u}{\partial t} - \frac{\partial^2 u}{\partial x^2} = t \cos \pi x \quad \text{in} \quad (0,1) \times (0,+\infty), \] with the boundary conditions: \[ \frac{\partial u}{\partial x}(0, t) = \frac{\partial u}{\partial x}(1, t) = 0, \quad t > 0, \] and the initial condition: \[ u(x,0) = x, \quad 0 < x < 1. \]
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