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Hyperbolic Sine - Exponent transition

  1. Feb 12, 2014 #1
    I didn't understand the transition below,
    I'd be glad for some help

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  3. Feb 12, 2014 #2


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    Multiply all the terms by ##e^{ih\omega/2}##.
    Then multiply all the terms by -1.
  4. Feb 12, 2014 #3
    Thanks !
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