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x² = 1 - x²
x² + x² = 1
2x² - 1 = 0
a = 2
c = - 1
a * c = - 2 < 0 to są dwa pierwiastki
x₁ = - √(- c/a) = - √(1/2) = - 1/√2 = - √2/2
x₂ = √(- c/a) = √(1/2) = 1/√2 = √2/2