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x in (-oo:+oo)
sin((1/2)*x) = 0
sin((1/2)*x) = 0 <=> (1/2)*x = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
(1/2)*x-t_1 = 0
1/2*x-t_1 = 0 // + t_1
1/2*x = t_1 // : 1/2
x = t_1/1/2
x = 2*t_1
x = 2*pi*k_1 i k_1 należy do I
x = 2*pi*k_1
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