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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
21/49 = 1.5/h // - 1.5/h
21/49-(1.5/h) = 0
21/49-1.5*h^-1 = 0
-1.5*h^-1 = -3/7 // : -1.5
h^-1 = 0.28571429
-1 < 0
1/(h^1) = 0.28571429 // * h^1
1 = 0.28571429*h^1 // : 0.28571429
3.49999995 = h^1
h = 3.49999995
h = 3.49999995
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