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D( p )
p = 0
4*p^2 = 0
9*p-9 = 0
p = 0
p = 0
4*p^2 = 0
4*p^2 = 0
4*p^2 = 0 // : 4
p^2 = 0
p = 0
9*p-9 = 0
9*p-9 = 0
9*p-9 = 0 // + 9
9*p = 9 // : 9
p = 9/9
p = 1
p in (-oo:0) U (0:1) U (1:+oo)
(((4*p-4)/p)/(9*p-9))/(4*p^2) = 0
(4*p-4)/(4*p*p^2*(9*p-9)) = 0
4*p-4 = 0 // + 4
4*p = 4 // : 4
p = 4/4
p = 1
p in { 1}
p belongs to the empty set
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