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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
3.6/h = 7.2/12.5 // - 7.2/12.5
3.6/h-(7.2/12.5) = 0
3.6/h-0.576 = 0
3.6*h^-1 = 0.576 // : 3.6
h^-1 = 0.16
-1 < 0
1/(h^1) = 0.16 // * h^1
1 = 0.16*h^1 // : 0.16
6.25 = h^1
h = 6.25
h = 6.25
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