. If in a triangle ABC, c4 - 2(a2 + b2) c2 + a4 + a2b2 + b4 = 0
If in a triangle ABC, c4 - 2(a2 + b2) c2 + a4 + a2b2 + b4 = 0, the angle C is equal to
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If in a triangle ABC, c4 - 2(a2 + b2) c2 + a4 + a2b2 + b4 = 0, the angle C is equal to