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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
0.25 = 3/k // - 3/k
0.25-(3/k) = 0
0.25-3*k^-1 = 0
-3*k^-1 = -0.25 // : -3
k^-1 = 0.08333333
-1 < 0
1/(k^1) = 0.08333333 // * k^1
1 = 0.08333333*k^1 // : 0.08333333
12.00000048 = k^1
k = 12.00000048
k = 12.00000048
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