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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
51/102 = 6/h // - 6/h
51/102-(6/h) = 0
51/102-6*h^-1 = 0
-6*h^-1 = -1/2 // : -6
h^-1 = 1/12
-1 < 0
1/(h^1) = 1/12 // * h^1
1 = 1/12*h^1 // : 1/12
12 = h^1
h = 12
h = 12
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