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sin² x/2 = 1/4
sin x/2 = 1/2 ∨ sin x/2 = -1/2
I
sin x/2 = 1/2
x/2 = 30 + k×360 ∨ 150 + k×360
x = 60 + 2k×360 ∨ 300 + 2k×360
II
x/2 = 210 + k×360 ∨ 330 + k×360
x = 420 + 2k×360 ∨ 660 + 2k×360
Cztery rozwiązania
x₁ = 60 + 2k×360
x₂ = 300 + 2k×360
x₃ = 420 + 2k×360
x₄ = 660 + 2k×360