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D( h )
h^3 = 0
h^3 = 0
h^3 = 0
1*h^3 = 0 // : 1
h^3 = 0
h = 0
h in (-oo:0) U (0:+oo)
1224/(h^3) = 0
1224*h^-3 = 0 // : 1224
h^-3 = 0
h należy do O
h belongs to the empty set
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