Z + or - i
and
z-1
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z2 = z * z * 1; z = z * 1. Greatest common factor is z.
It is Z.
(z - 4)(x + y)
The greatest common factor of 6 and 9 is not 5.
If z = a + ib then arg(z) = arctan(b/a) Let z' denote the conjugate of z. Therefore, z' = a - ib Then arg(z') = arctan(-b/a) = 2*pi - arctan(b/a) = 2*pi - arg(z)