Complex NumbersHard

Question

If |z1 + z2|2 = |z1|2 + |zz|2 then

Options

A. is purely real
B. is purely imaginary
C. = 0
D.amp may be equal to

Solution

|z1 + z2|2 = |z1|2 + |z2|2

⇒ 
  ⇒  is purely imaginary
so amp is may be or  -

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