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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)
-1/(c^2) = -1/3 // + -1/3
-1/(c^2)-(-1/3) = 0
1/3-1/(c^2) = 0
-1*c^-2 = -1/3 // : -1
c^-2 = 1/3
-2 < 0
1/(c^2) = 1/3 // * c^2
1 = 1/3*c^2 // : 1/3
3 = c^2
c^2 = 3 // ^ 1/2
abs(c) = 3^(1/2)
c = 3^(1/2) or c = -3^(1/2)
c in { 3^(1/2), -3^(1/2) }
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