This problem seems to send me down an endless path of failure. I could do with some hints. Many thanks, Bobak
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We will show that, for Note that is a primitive root of unity of which means all the roots are given by . But the sum of the roots of unity is zero, thus (by de Moivre), .
Yeah i actually got a bit lost on the first "show by direct substitution part" i kept going around in circles.
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