# Prove the following equality

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• Mar 24th 2011, 03:53 AM
mia25
Prove the following equality
Attachment 21244

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any idea that help in proving this equality is appretiated.

Thanks
• Mar 24th 2011, 05:10 AM
Prove It
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...