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