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dla x=0, y=0
x² + y² ≥ 2xy
0² + 0² = 1 + 1 ≥ 2xy
0+0 ≥ 2xy
dla x=2, y=2
x² + y² ≥ 2xy
2² + 2² = 4 + 4 ≥ 2xy
2+2 ≥ 2xy