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D( c )
(2*c)^8 = 0
(2*c)^8 = 0
(2*c)^8 = 0
256*c^8 = 0 // : 256
c^8 = 0
c = 0
c in (-oo:0) U (0:+oo)
(c^3*(4*c)^5)/((2*c)^8) = 0
4 = 0
c belongs to the empty set
c belongs to the empty set
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