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x in (-oo:+oo)
cos((3.14/6)*x) = 0
cos((3.14/6)*x) = 0 <=> (3.14/6)*x = pi*k_1+pi/2 i k_1 należy do I
t_1 = pi*k_1+pi/2
(3.14/6)*x-t_1 = 0
0.52333333*x-t_1 = 0 // + t_1
0.52333333*x = t_1 // : 0.52333333
x = t_1/0.52333333
x = 1.91082804*t_1
x = 1.91082804*pi*k_1+pi/2 i k_1 należy do I
x = 1.91082804*pi*k_1+pi/2
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