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D( p )
p^3 = 0
p^3 = 0
p^3 = 0
1*p^3 = 0 // : 1
p^3 = 0
p = 0
p in (-oo:0) U (0:+oo)
(6*8*p*p^3)/(p^3) = 0
48*p = 0 // : 48
p = 0
p in { 0}
p belongs to the empty set
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