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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
8/h = 288 // - 288
8/h-288 = 0
8*h^-1 = 288 // : 8
h^-1 = 36
-1 < 0
1/(h^1) = 36 // * h^1
1 = 36*h^1 // : 36
1/36 = h^1
h = 1/36
h = 1/36
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