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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
4/c = 49.44 // - 49.44
4/c-49.44 = 0
4*c^-1 = 49.44 // : 4
c^-1 = 12.36
-1 < 0
1/(c^1) = 12.36 // * c^1
1 = 12.36*c^1 // : 12.36
0.08090615 = c^1
c = 0.08090615
c = 0.08090615
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