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Where is the error is this 'identity'?:

[tex](-e^i)^{\frac{1}{2}} = (-1)^{\frac{1}{2}}*e^{\frac{i}{2}}[/tex]

My calculator says that the right side is minus one times the left but I can't see the mistake I'v made. Help me please, thanks.

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# Need a quick help with a simple identity

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