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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin(2/x) = 0
sin(2/x) = 0 <=> 2/x = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
2/x-t_1 = 0
2*x^-1 = t_1 // : 2
x^-1 = t_1/2
-1 < 0
1/(x^1) = t_1/2 // * x^1
1 = (t_1/2)*x^1 // : t_1/2
2*t_1^-1 = x^1
x = 2*t_1^-1
x = 2*pi*k_1^-1 i k_1 należy do I
x = 2*pi*k_1^-1
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