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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
2.4/h = 4/16.5 // - 4/16.5
2.4/h-(4/16.5) = 0
2.4/h-0.24242424 = 0
2.4*h^-1 = 0.24242424 // : 2.4
h^-1 = 0.1010101
-1 < 0
1/(h^1) = 0.1010101 // * h^1
1 = 0.1010101*h^1 // : 0.1010101
9.9000001 = h^1
h = 9.9000001
h = 9.9000001
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