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D( p )
p = 0
9*p^3 = 0
p = 0
p = 0
9*p^3 = 0
9*p^3 = 0
9*p^3 = 0 // : 9
p^3 = 0
p = 0
p in (-oo:0) U (0:+oo)
(5*p^-5)/(9*p^3) = 0
5/9*p^-8 = 0 // : 5/9
p^-8 = 0
p naleu017Cy do O
p belongs to the empty set
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