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D( P )
11*P^4 = 0
11*P^4 = 0
11*P^4 = 0
11*P^4 = 0 // : 11
P^4 = 0
P = 0
P in (-oo:0) U (0:+oo)
(5*P^3)/(11*P^4) = 0
5/11*P^-1 = 0 // : 5/11
P^-1 = 0
P należy do O
P belongs to the empty set
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