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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
1/c = 4.5/11.7 // - 4.5/11.7
1/c-(4.5/11.7) = 0
1/c-0.38461538 = 0
1*c^-1 = 0.38461538 // : 1
c^-1 = 0.38461538
-1 < 0
1/(c^1) = 0.38461538 // * c^1
1 = 0.38461538*c^1 // : 0.38461538
2.60000003 = c^1
c = 2.60000003
c = 2.60000003
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