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If z1a n dz2 are two nonzero complex num...

If `z_1a n dz_2` are two nonzero complex numbers such that =`|z_1+z_2|=|z_1|+|z_2|,` then `a rgz_1-a r g z_2` is equal to

A

`-pi`

B

`-pi//2`

C

`pi//2`

D

0

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The correct Answer is:
D
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