If `z_(1)` and `z_(2)` are two `n^(th)` roots of unity, then arg `(z_(1)/z_(2))` is a multiple of

If z_(1) and z_(2) are two of the 8^(th) roots of unity such that arg (z_(1)/z_(2)) is last positive, then z_(1)/z_(2) is

If 1,z_1z_2,……z_(n-1) are the n^th roots of unity, then (1-z_1)(1-z_2)…..(1-z_(n-1))= .

If z_(1),z_(2),z_(3),…………..,z_(n) are n nth roots of unity, then for k=1,2,,………,n

If z_(1),z_(2),z_(3),…………..,z_(n) are n nth roots of unity, then for k=1,2,,………,n

If z_(1),z_(2),z_(3),…………..,z_(n) are n nth roots of unity, then for k=1,2,,………,n

If z_(1),z_(2),z_(3),…………..,z_(n) are n nth roots of unity, then for k=1,2,,………,n

1,z_(1),z_(2),z_(3),......,z_(n-1), are the nth roots of unity, then (1-z_(1))(1-z_(2))...(1-z_(n-1)) is

Let z_(1) and z_(2) be n^(th ) roots of unity which subtend a right angle at the origin. Then n must be of the form.