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D( p )
p = 0
p^-3 = 0
p = 0
p = 0
p^-3 = 0
p^-3 = 0
1*p^-3 = 0 // : 1
p^-3 = 0
p naleu017Cy do O
p in (-oo:0) U (0:+oo)
((p^5)/(p^-3))/2 = 0
1/2*p^8 = 0 // : 1/2
p^8 = 0
p = 0
p in { 0}
p belongs to the empty set
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