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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
6/61 = 12/h // - 12/h
6/61-(12/h) = 0
6/61-12*h^-1 = 0
-12*h^-1 = -6/61 // : -12
h^-1 = 1/122
-1 < 0
1/(h^1) = 1/122 // * h^1
1 = 1/122*h^1 // : 1/122
122 = h^1
h = 122
h = 122
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