If z1, z2 are two complex numbers (z1!=z...

If `z_1, z_2` are two complex numbers `(z_1!=z_2)` satisfying `|z1^2-z2^2|=| z 1^2+ z 2 ^2-2( z )_1( z )_2|` , then a.`(z_1)/(z_2)` is purely imaginary b. `(z_1)/(z_2)` is purely real c. `|a r g z_1-a rgz_2|=pi` d. `|a r g z_1-a rgz_2|=pi/2`

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