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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
41/h = 66 // - 66
41/h-66 = 0
41*h^-1 = 66 // : 41
h^-1 = 66/41
-1 < 0
1/(h^1) = 66/41 // * h^1
1 = 66/41*h^1 // : 66/41
41/66 = h^1
h = 41/66
h = 41/66
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