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D( x )
(x/2)^2 = 0
(x/2)^2 = 0
(x/2)^2 = 0
1/4*x^2 = 0 // : 1/4
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(1000*x)/((x/2)^2) = 0
4000*x^-1 = 0 // : 4000
x^-1 = 0
x należy do O
x belongs to the empty set
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