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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
1/h = 132/660 // - 132/660
1/h-(132/660) = 0
1/h-1/5 = 0
1*h^-1 = 1/5 // : 1
h^-1 = 1/5
-1 < 0
1/(h^1) = 1/5 // * h^1
1 = 1/5*h^1 // : 1/5
5 = h^1
h = 5
h = 5
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