If ${z_1}$ and ${z_2}$ are any two complex numbers then $|{z_1} + {z_2}{|^2}$ $ + |{z_1} - {z_2}{|^2}$ is equal to
If ${z_1}$ and ${z_2}$ are any two complex numbers then $|{z_1} + {z_2}{|^2}$ $ + |{z_1} - {z_2}{|^2}$ is equal to
- A
$2|{z_1}{|^2}\,|{z_2}{|^2}$
- B
$2|{z_1}{|^2} + \,2\,\,|{z_2}{|^2}$
- C
$|{z_1}{|^2} + \,|{z_2}{|^2}$
- D
$2|{z_1}|\,\,|{z_2}|$
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