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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
-2/c = 2 // - 2
-2/c-2 = 0
-2*c^-1 = 2 // : -2
c^-1 = -1
-1 < 0
1/(c^1) = -1 // * c^1
1 = -1*c^1 // : -1
-1 = c^1
c = -1
c = -1
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