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D( h )
h/5 = 0
h/5 = 0
h/5 = 0
1/5*h = 0 // : 1/5
h = 0
h in (-oo:0) U (0:+oo)
(h/5)^-2 = 0
25*h^-2 = 0 // : 25
h^-2 = 0
h należy do O
h belongs to the empty set
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