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psk981

  • 3 years ago

consider a boundary value problem y"+ky=0, y(0)=0, Y(pi/2)=0. is it possible to determine the values k for trivial solutions. (b) non-trivial.

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  1. malevolence19
    • 3 years ago
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    \[y''+ky=0 \implies y=A \cos(\sqrt k t)+B \sin(\sqrt k t)\] From here you can plug in the initial conditions

  2. across
    • 3 years ago
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    Since the boundary conditions are homogeneous, your non-trivial solution (the case \(k>0\)) will be a Fourier sine series. For \(k\leqslant0\), you'll get trivial solutions.

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