Find the value of k if for the complex numbers z1 and z2 , 1-z1¯z22-z1-z22=k1-z121-z22

Find the value of k if for the complex numbers $z_{1} a n d z_{2}, {|1 - \bar{z_{1}} z_{2}|}^{2} - {|z_{1} - z_{2}|}^{2} = k (1 - {|z_{1}|}^{2}) (1 - {|z_{2}|}^{2})$

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