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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
1/2 = c/c-5 // - c/c-5
1/2-(c/c)+5 = 0
1/2-1+5 = 0
9/2 = 0
c belongs to the empty set
c belongs to the empty set
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