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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
48/h = -16 // + 16
48/h+16 = 0
48*h^-1 = -16 // : 48
h^-1 = -1/3
-1 < 0
1/(h^1) = -1/3 // * h^1
1 = -1/3*h^1 // : -1/3
-3 = h^1
h = -3
h = -3
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