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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
5/12 = 1.25/k // - 1.25/k
5/12-(1.25/k) = 0
5/12-1.25*k^-1 = 0
-1.25*k^-1 = -5/12 // : -1.25
k^-1 = 0.33333334
-1 < 0
1/(k^1) = 0.33333334 // * k^1
1 = 0.33333334*k^1 // : 0.33333334
2.99999994 = k^1
k = 2.99999994
k = 2.99999994
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