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z1 and z2 be two complex no. then prove ...

`z_1` and `z_2` be two complex no. then prove that `abs(z_1+z_2)^2+abs(z_1-z_2)^2=2[abs(z_1)^2+abs(z_2)^2]`

A

`absz_2=1`

B

`z_2=0`

C

`absz_2=alpha`

D

`absz_2ltalpha`

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The correct Answer is:
A
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