If ∣z1∣=3|z_1| = 3∣z1∣=3 and ∣z2∣=4|z_2| = 4∣z2∣=4, then ∣z1+z2∣2+∣z1−z2∣2|z_1 + z_2|^2 + |z_1 - z_2|^2∣z1+z2∣2+∣z1−z2∣2 equals
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