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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
3/h+10 = 1 // - 1
3/h-1+10 = 0
3*h^-1 = -9 // : 3
h^-1 = -3
-1 < 0
1/(h^1) = -3 // * h^1
1 = -3*h^1 // : -3
-1/3 = h^1
h = -1/3
h = -1/3
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