(x - y)2 >= 0 since the left hand side is a square.
ie x2 - 2xy + y2 >= 0
so x2 + y2 >= 2xy
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The two inequalities define a region of the coordinate plane: there is no unique solution.
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One plus one does equal two. If you have one object, then bring in another object, you will have one more than what you started with. That would be two.
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Less than Less than or equal to Equal to Greater than Greater than or equal to