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Math Help - Prove the following equality

  1. #1
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    Prove the following equality

    Prove the following equality-24032011354.jpg

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    any idea that help in proving this equality is appretiated.

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  2. #2
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    Substitute the MacLaurin series for \displaystyle e^z, e^{-\frac{1}{2}z} and \displaystyle \cos{\frac{z\sqrt{3}}{2}} into RHS and simplify...
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