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D( c )
c^2 = 0
c^2 = 0
c^2 = 0
1*c^2 = 0 // : 1
c^2 = 0
c = 0
c in (-oo:0) U (0:+oo)
3/(c^2)-(6*c) = 0
3/(c^2)-6*c = 0
3*c^-2-6*c = 0
3*c*(c^-3-2) = 0
1*c^-3 = 2 // : 1
c^-3 = 2
-3 < 0
1/(c^3) = 2 // * c^3
1 = 2*c^3 // : 2
1/2 = c^3
c^3 = 1/2 // ^ 1/3
c = (1/2)^(1/3)
3*c = 0
3*c = 0 // : 3
c = 0
c in { 0}
c = (1/2)^(1/3)
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