It is proved that the square of a plus the square of B is greater than or equal to 2Ab

It is proved that the square of a plus the square of B is greater than or equal to 2Ab

（a-b）2=a2+b2-2ab
Because the square of A-B is greater than or equal to zero, A2 + b2-2ab is greater than or equal to 0
So the square of a plus the square of B is greater than or equal to 2Ab

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