please solve this question ....?
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(z1+z2)²+(z1-z2)²
=|z1|²+|z2|²+2.|Z1|.|Z2|+|Z1|²+|Z2|²-2.|Z1|.|Z2|
=2[|Z1|²+|Z2|²]
=|z1|²+|z2|²+2.|Z1|.|Z2|+|Z1|²+|Z2|²-2.|Z1|.|Z2|
=2[|Z1|²+|Z2|²]
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