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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
7/1 = 6/h // - 6/h
7/1-(6/h) = 0
7-6*h^-1 = 0
-6*h^-1 = -7 // : -6
h^-1 = 7/6
-1 < 0
1/(h^1) = 7/6 // * h^1
1 = 7/6*h^1 // : 7/6
6/7 = h^1
h = 6/7
h = 6/7
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