Wykaż, żę jeśli i to
x² + y² = (x + y)² - 2xy
2 = 1² - 2xy
2 = 1 - 2xy
2 - 1 = -2xy
2xy = -1
xy = -1/2
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x² + y² = (x + y)² - 2xy
2 = 1² - 2xy
2 = 1 - 2xy
2 - 1 = -2xy
2xy = -1
xy = -1/2