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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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