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D( p )
(4*p)/2 = 0
(4*p)/2 = 0
(4*p)/2 = 0
2*p = 0 // : 2
p = 0
p in (-oo:0) U (0:+oo)
64/((4*p)/2) = 0
32*p^-1 = 0 // : 32
p^-1 = 0
p należy do O
p belongs to the empty set
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