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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
11 = 6/h+8 // - 6/h+8
11-(6/h)-8 = 0
11-6*h^-1-8 = 0
-6*h^-1 = -3 // : -6
h^-1 = 1/2
-1 < 0
1/(h^1) = 1/2 // * h^1
1 = 1/2*h^1 // : 1/2
2 = h^1
h = 2
h = 2
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