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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
4/p-(2/3) = (5/2)*p // - (5/2)*p
4/p-((5/2)*p)-(2/3) = 0
(-5/2)*p+4/p-2/3 = 0
4*p^-1-5/2*p^1-2/3*p^0 = 0
(4*p^0-5/2*p^2-2/3*p^1)/(p^1) = 0 // * p^2
p^1*(4*p^0-5/2*p^2-2/3*p^1) = 0
p^1
(-5/2)*p^2+(-2/3)*p+4 = 0
(-5/2)*p^2+(-2/3)*p+4 = 0
DELTA = (-2/3)^2-(4*4*(-5/2))
DELTA = 364/9
DELTA > 0
p = ((364/9)^(1/2)-(-2/3))/(2*(-5/2)) or p = (-(-2/3)-(364/9)^(1/2))/(2*(-5/2))
p = ((364/9)^(1/2)+2/3)/(-5) or p = (2/3-(364/9)^(1/2))/(-5)
p in { ((364/9)^(1/2)+2/3)/(-5), (2/3-(364/9)^(1/2))/(-5)}
p in { ((364/9)^(1/2)+2/3)/(-5), (2/3-(364/9)^(1/2))/(-5) }
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