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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
1.5/h = 3/12.6 // - 3/12.6
1.5/h-(3/12.6) = 0
1.5/h-0.23809524 = 0
1.5*h^-1 = 0.23809524 // : 1.5
h^-1 = 0.15873016
-1 < 0
1/(h^1) = 0.15873016 // * h^1
1 = 0.15873016*h^1 // : 0.15873016
6.29999995 = h^1
h = 6.29999995
h = 6.29999995
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