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x in (-oo:+oo)
sin(12*x)/2 = 0
sin(12*x)/2 = 0 // * 2
sin(12*x) = 0
sin(12*x) = 0 <=> 12*x = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
12*x-t_1 = 0
12*x-t_1 = 0 // + t_1
12*x = t_1 // : 12
x = t_1/12
x = pi*k_1/12 i k_1 należy do I
x = pi*k_1/12
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