Question

The ____________ of the complex number z = r(cos + i sin) is the angle theta.

Answer 1

r(cos(0) + i sin(0)) = r
Just joking :)

Answer 2

Argument

z = r cosƟ + ir sinƟ = r(cosƟ + i sin Ɵ) and this representation
of z is called the polar representation or modulus–argument form of z.

Answer 3

@kropot72 Thanks. Ɵ

Answer 4

No worries!