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x in (-oo:+oo)
sin(2*x-(8/3)) = 0
sin(2*x-8/3) = 0
sin(2*x-(8/3)) = 0 <=> 2*x-(8/3) = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
2*x-t_1-(8/3) = 0
2*x-t_1-8/3 = 0
2*x-t_1-8/3 = 0 // + -t_1-8/3
2*x = -(-t_1-8/3) // : 2
x = (-(-t_1-8/3))/2
x = (t_1+8/3)/2
x = (pi*k_1+8/3)/2 i k_1 należy do I
x = (pi*k_1+8/3)/2
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