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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
4/1.96 = 1/c // - 1/c
4/1.96-(1/c) = 0
4/1.96-c^-1 = 0
-1*c^-1 = -2.04081633 // : -1
c^-1 = 2.04081633
-1 < 0
1/(c^1) = 2.04081633 // * c^1
1 = 2.04081633*c^1 // : 2.04081633
0.49 = c^1
c = 0.49
c = 0.49
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