y"+y= cost 0 if 0 ≤ t < π if + > T t " y(0) = 2, y'(0) = 0.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Hi, can I get some help with this Differential Equations problem?

  • Use Laplace transform and partial fraction decomposition to solve the initial value problem.
  • Express y as a piecewise function of the form y = [] if 0 <= t < pi, [] if t >= pi

Thank you!

The given expression represents a piecewise differential equation alongside initial conditions. Below is the transcribed explanation suitable for an educational website:

---

### Differential Equation with Piecewise Function

Consider the following second-order linear differential equation:

\[ y'' + y = \begin{cases} 
\cos t, & \text{if } 0 \leq t < \pi \\
0, & \text{if } t \geq \pi 
\end{cases} \]

This differential equation is subject to initial conditions:

\[ y(0) = 2, \quad y'(0) = 0 \]

**Explanation:**
- The equation \( y'' + y = \cos t \) applies when \( 0 \leq t < \pi \). 
- For \( t \geq \pi \), the equation simplifies to \( y'' + y = 0 \).

The initial conditions provided help determine the specific solution to this differential equation. At \( t = 0 \):
- The value of \( y \) is 2.
- The derivative of \( y \) with respect to \( t \), denoted as \( y' \), is 0.

Understanding how to solve piecewise differential equations involves solving each segment independently while ensuring that the solutions are consistent at the points where the function changes its definition, in this case, at \( t = \pi \).

---

This provides a clear explanation for an educational purpose, ensuring students can grasp the context and details of the differential equation provided.
Transcribed Image Text:The given expression represents a piecewise differential equation alongside initial conditions. Below is the transcribed explanation suitable for an educational website: --- ### Differential Equation with Piecewise Function Consider the following second-order linear differential equation: \[ y'' + y = \begin{cases} \cos t, & \text{if } 0 \leq t < \pi \\ 0, & \text{if } t \geq \pi \end{cases} \] This differential equation is subject to initial conditions: \[ y(0) = 2, \quad y'(0) = 0 \] **Explanation:** - The equation \( y'' + y = \cos t \) applies when \( 0 \leq t < \pi \). - For \( t \geq \pi \), the equation simplifies to \( y'' + y = 0 \). The initial conditions provided help determine the specific solution to this differential equation. At \( t = 0 \): - The value of \( y \) is 2. - The derivative of \( y \) with respect to \( t \), denoted as \( y' \), is 0. Understanding how to solve piecewise differential equations involves solving each segment independently while ensuring that the solutions are consistent at the points where the function changes its definition, in this case, at \( t = \pi \). --- This provides a clear explanation for an educational purpose, ensuring students can grasp the context and details of the differential equation provided.
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