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If 1,alpha(1),alpha(2),…………….,alpha(n-1)...

If `1,alpha_(1),alpha_(2),…………….,alpha_(n-1)` are `n^(th)` roots of unity and n is an even natural number, then
`(1+alpha_(1))(1+alpha_(2))(1+alpha_(3))……(1+alpha_(n-1))` equals

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