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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
-32/h = -1/8 // + -1/8
-32/h-(-1/8) = 0
1/8-32/h = 0
-32*h^-1 = -1/8 // : -32
h^-1 = 1/256
-1 < 0
1/(h^1) = 1/256 // * h^1
1 = 1/256*h^1 // : 1/256
256 = h^1
h = 256
h = 256
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