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D( p )
p^2 = 0
p^2 = 0
p^2 = 0
1*p^2 = 0 // : 1
p^2 = 0
p = 0
p in (-oo:0) U (0:+oo)
30/(p^2) = 0
30*p^-2 = 0 // : 30
p^-2 = 0
p należy do O
p belongs to the empty set
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