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Roots of unity HELP

Hy guys...i am doing this..

basically i have got the z^n=1..i know is called roots of unity for the given n that equals all positive numbers...but what would then happen if n=0 and n= any non positive number?
thanks...
What do you think happens?
i dont know this is why is ask :-)

thanks
Well anything to the power of 0 is 1? have you come across that?

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