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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
3*p-((8/3)*p^2)-(((3/p)/8)*p) = 0
(-8/3)*p^2+3*p-3/8 = 0
3*p-8/3*p^2-3/8 = 0
DELTA = 3^2-(-8/3*(-3/8)*4)
DELTA = 5
DELTA > 0
p = (5^(1/2)-3)/(-8/3*2) or p = (-5^(1/2)-3)/(-8/3*2)
p = -3/16*(5^(1/2)-3) or p = 3/16*(5^(1/2)+3)
p in { -3/16*(5^(1/2)-3), 3/16*(5^(1/2)+3) }
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