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wzór
(a - b)² = a² - 2ab + b²
[√(2 + √3) - √(2 - √3)]² = [√(2 + √3)]² - 2√(2 + √3)(2 - √3) + [(2 - √3)]² =
= 2 + √3 - [2√(4 - 3)] + 2 - √3 = 4 - 2√1 = 4 -2=2