INFO:
An oscillation equation <em>d<sup>2</sup>y/dt<sup>2</sup> + Sy =</em> 0 has <em>2n</em> solutions (sines and cosines). Solutions use the eigenvectors of <em>S.</em>

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・This video 「

Differential Equations and Linear Algebra, 6.5b: Second Order Systems, y''+Sy=0 - MATLAB & Simulink

」@mathworks.com
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