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D( c )
(6*c^4)^2 = 0
(6*c^4)^2 = 0
(6*c^4)^2 = 0
36*c^8 = 0 // : 36
c^8 = 0
c = 0
c in (-oo:0) U (0:+oo)
(18*c^11)/((6*c^4)^2) = 0
1/2*c^3 = 0 // : 1/2
c^3 = 0
c = 0
c in { 0}
c belongs to the empty set
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