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x in (-oo:+oo)
sin(1.57*x)/0.5 = 0
sin(1.57*x)/0.5 = 0 // * 0.5
sin(1.57*x) = 0
sin(1.57*x) = 0 <=> 1.57*x = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
1.57*x-t_1 = 0
1.57*x-t_1 = 0 // + t_1
1.57*x = t_1 // : 1.57
x = t_1/1.57
x = 0.63694268*t_1
x = 0.63694268*pi*k_1 i k_1 należy do I
x = 0.63694268*pi*k_1
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