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Dec 25, 2016 at 11:38 vote accept Meep
Dec 25, 2016 at 11:29 comment added Meep Oh I see: I ignored the fact that k/m is the square of omega. Complex omega gives real exponentials (or else putting it straight into the cosine form would result in a cosh function, which is actually just exponential. Thank you.
Dec 25, 2016 at 11:23 history answered AccidentalFourierTransform CC BY-SA 3.0