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x in (-oo:+oo)
(1/3)*sin(3*x) = 0
1/3 = 0
1/3 = 0
x belongs to the empty set
sin(3*x) = 0
sin(3*x) = 0 <=> 3*x = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
3*x-t_1 = 0
3*x-t_1 = 0 // + t_1
3*x = t_1 // : 3
x = t_1/3
x = pi*k_1/3 i k_1 należy do I
(1/3)*sin(3*x) = 0 <=> 1/3 = 0 or (1/3)*sin(3*x) = 0 <=> sin(3*x) = 0
x = pi*k_1/3
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