(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Solving the linked set of ODEs:

y" + y = 1-t^2/π^2 for 0 ≤ t ≤ π

y" + y = 0 for t > π

We are given the initial condition that y(0) = y'(0) = 0, and it is also noted that y and y' must be continuous at t = π

2. Relevant equations

See above.

3. The attempt at a solution

The non-homogeneous ODE when t is between 0 and π didn't give me too much trouble, but it's the seemingly simpler homogeneous case for t > π that I'm struggling with: everything seems to go to zero!

The root of the characteristic equation is ±i.

That gives a solution of y = A cos t + B sin t, but using the given initial conditions both A and B are 0.

Thanks for any help you can offer.

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# Homework Help: Second order homogeneous ODE with vanishing solution

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