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podstawienie sin(1/2x) = t
-1 ≤ t ≤1
t² + 1 = 2t
t² - 2t +1 = 0
(t - 1)² = 0
t = 1
sin (1/2x) = 1
1/2x = π/2 + 2kπ (mnożę stronami przez 2)
x = π + 4kπ, k ∈ C