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D( c )
c^2 = 0
c = 0
c^2 = 0
c^2 = 0
1*c^2 = 0 // : 1
c^2 = 0
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
(c^2)/(c^2)-(c/c)-4-2 = 0
(c^2)/(c^2)-4-2-1 = 0
-6 = 0
c belongs to the empty set
c belongs to the empty set
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