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x in (-oo:+oo)
(1/4)*sin(2*x) = 0
1/4 = 0
1/4 = 0 // * 4
1 = 0
sin(2*x) = 0
sin(2*x) = 0 <=> 2*x = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
2*x-t_1 = 0
2*x-t_1 = 0 // + t_1
2*x = t_1 // : 2
x = t_1/2
x = pi*k_1/2 i k_1 należy do I
(1/4)*sin(2*x) = 0 <=> 1/4 = 0 or (1/4)*sin(2*x) = 0 <=> sin(2*x) = 0
x = pi*k_1/2
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