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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin((10*pi)/x) = 0
sin((10*pi)/x) = 0 <=> (10*pi)/x = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
(10*pi)/x-t_1 = 0
10*pi*x^-1 = t_1 // : 10*pi
x^-1 = t_1/(10*pi)
-1 < 0
1/(x^1) = t_1/(10*pi) // * x^1
1 = (t_1/(10*pi))*x^1 // : t_1/(10*pi)
10*pi*t_1^-1 = x^1
x = 10*pi*t_1^-1
x = 10*pi*pi*k_1^-1 i k_1 należy do I
x = 10*pi*pi*k_1^-1
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