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    How can I prove peroidic of state of simple harmonic

    I usually use f(x+t)=f(x), but here I am not sure how can I prove it.
  2. A

    How can I prove peroidic of state of simple harmonic

    Hi How can I prove peroidic of state of simple harmonic Y(x)=exp(iwt/2 sum(Cn Un (x) exp(-iwnt) )
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