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D( P )
P-4 = 0
P-4 = 0
P-4 = 0
P-4 = 0 // + 4
P = 4
P in (-oo:4) U (4:+oo)
(P^3-64)/(P-4) = 0
1*P^3 = 64 // : 1
P^3 = 64
P^3 = 64 // ^ 1/3
P = 4
P in { 4}
P belongs to the empty set
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