Question

Let z1=x +iy and z2=a+ib, and suppose z1=z2.
Which of the following is/are true?
A. x=a and y=b.
B. The arguments of z1 and z2 differ by a multiple of 2π

Answer 1

B. The arguments of z1 and z2 differ by a multiple of 2π

Answer 2

They are both true, if by a multiple you can include 0 (not only).