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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
4 = 16/h // - 16/h
4-(16/h) = 0
4-16*h^-1 = 0
-16*h^-1 = -4 // : -16
h^-1 = 1/4
-1 < 0
1/(h^1) = 1/4 // * h^1
1 = 1/4*h^1 // : 1/4
4 = h^1
h = 4
h = 4
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