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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
3.5/1.5 = 6/h // - 6/h
3.5/1.5-(6/h) = 0
3.5/1.5-6*h^-1 = 0
-6*h^-1 = -2.33333333 // : -6
h^-1 = 0.38888889
-1 < 0
1/(h^1) = 0.38888889 // * h^1
1 = 0.38888889*h^1 // : 0.38888889
2.57142856 = h^1
h = 2.57142856
h = 2.57142856
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