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x in (-oo:+oo)
sin(3.14*x)/L = 0
sin(3.14*x)/L = 0 // * L
sin(3.14*x) = 0
sin(3.14*x) = 0 <=> 3.14*x = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
3.14*x-t_1 = 0
3.14*x-t_1 = 0 // + t_1
3.14*x = t_1 // : 3.14
x = t_1/3.14
x = 0.31847134*t_1
x = 0.31847134*pi*k_1 i k_1 należy do I
x = 0.31847134*pi*k_1
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