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D( c )
(c-3)^3 = 0
(c-3)^3 = 0
(c-3)^3 = 0
c-3 = 0 // + 3
c = 3
c in (-oo:3) U (3:+oo)
3/4 = -6/((c-3)^3) // + -6/((c-3)^3)
3/4-(-6/((c-3)^3)) = 0
6*(c-3)^-3+3/4 = 0
6/((c-3)^3)+3/4 = 0
(4*6)/(4*(c-3)^3)+(3*(c-3)^3)/(4*(c-3)^3) = 0
3*(c-3)^3+4*6 = 0
3*c^3-27*c^2+81*c-57 = 0
3*c^3-27*c^2+81*c-57 = 0
3*(c^3-9*c^2+27*c-19) = 0
c^3-9*c^2+27*c-19 = 0
{ 1, -1, 19, -19 }
1
c = 1
c^3-9*c^2+27*c-19 = 0
1
c-1
c^2-8*c+19
c^3-9*c^2+27*c-19
c-1
c^2-c^3
27*c-8*c^2-19
8*c^2-8*c
19*c-19
19-19*c
0
c^2-8*c+19 = 0
DELTA = (-8)^2-(1*4*19)
DELTA = -12
DELTA < 0
c in { 1}
3*(c-1) = 0
(3*(c-1))/(4*(c-3)^3) = 0
(3*(c-1))/(4*(c-3)^3) = 0 // * 4*(c-3)^3
3*(c-1) = 0
c-1 = 0 // + 1
c = 1
c = 1
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