Let z1 and z2 be two complex numbers such that |z1 + z2| = |z1| + |z2|, then arg (z1) – arg (z2) = ____________.

Let z1 and z2 be two complex numbers such that |z1 + z2| = |z1| + |z2|

1.	Let z1 and z2 be two complex numbers such that \|z1 + z2\| = \|z1\| + \|z2\|, then arg (z1) – arg (z2) = ____________.
Answer» Let z₁ and z₂ be two complex numbers such that \|z₁ + z₂\| = \|z₁\| + \|z₂\|, then arg (z₁) – arg (z₂) = ____________.