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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
(2*p)/3-(1/p) = 2*p-(1/3) // - 2*p-(1/3)
(2*p)/3-(2*p)-(1/p)+1/3 = 0
(2*p)/3-2*p-p^-1+1/3 = 0
1/3*p^0-4/3*p^1-1*p^-1 = 0
(1/3*p^1-4/3*p^2-1*p^0)/(p^1) = 0 // * p^2
p^1*(1/3*p^1-4/3*p^2-1*p^0) = 0
p^1
(-4/3)*p^2+(1/3)*p-1 = 0
(-4/3)*p^2+(1/3)*p-1 = 0
DELTA = (1/3)^2-(-1*4*(-4/3))
DELTA = -47/9
DELTA < 0
p in { }
p belongs to the empty set
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