If 1,a(1), a(2). ..., a(n-1) are n roots...

If 1,`a_(1), a_(2). ..., a_(n-1)` are n roots of unity, then the value of `(1 - a_(1)) (1 - a_(2)) .... (1 - a_(n-1)) ` is :

` sqrt(3)`

`(1)/(2)`

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