$(a^2-b^2)(|z_1|^2-|z_2|^2)$

$(a^2-b^2)(|z_1|^2-|z_2|^2)$
$(a^2-b^2)(|z_1|^2-|z_2|^2)$
$(a^2-b^2)(|z_1|^2-|z_2|^2)$
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