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D( q )
q^-3 = 0
q = 0
q^-3 = 0
q^-3 = 0
1*q^-3 = 0 // : 1
q^-3 = 0
q należy do O
q = 0
q = 0
q in (-oo:0) U (0:+oo)
5/(q^-3) = 0
5*q^3 = 0 // : 5
q^3 = 0
q = 0
q in { 0}
q belongs to the empty set
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