Hyperbolic Sine - Exponent transition

1. Feb 12, 2014

porcupineman23

Hey
I didn't understand the transition below,
I'd be glad for some help
thanks

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2. Feb 12, 2014

AlephZero

Multiply all the terms by $e^{ih\omega/2}$.
Then multiply all the terms by -1.

3. Feb 12, 2014

Thanks !