If ${z_1}$ and ${z_2}$ are two non-zero complex numbers such that $\,\left| {{z_1} + {z_2}} \right| = \left| {{z_1}} \right| + \left| {{z_2}} \right|$, then arg ${z_1}$ - arg ${z_2}$ is equal to :
${\pi \over 2}\,$
$ - \pi $
0
${{ - \pi } \over 2}$
Solution
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