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D( p )
(p^3)/2 = 0
(p^3)/2 = 0
(p^3)/2 = 0
1/2*p^3 = 0 // : 1/2
p^3 = 0
p = 0
p in (-oo:0) U (0:+oo)
((p^3)/2)^-2 = 0
4*p^-6 = 0 // : 4
p^-6 = 0
p należy do O
p belongs to the empty set
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