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