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D( c )
c^2 = 0
c^2 = 0
c^2 = 0
1*c^2 = 0 // : 1
c^2 = 0
c = 0
c in (-oo:0) U (0:+oo)
12/(c^2) = 0
12*c^-2 = 0 // : 12
c^-2 = 0
c naleu017Cy do O
c belongs to the empty set
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