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If z1 and z2 are two non-zero complex n...

If `z_1 `and` z_2` are two non-zero complex numbers such that `abs(z_1+z_2) = abs(z_1)+abs(z_2)`, then `arg(z_1)-arg(z_2)` is equal to

A

`A.-pi`

B

`B.-frac{pi}{2}`

C

`C.frac{pi}{2}`

D

`D.0`

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