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D( h )
h < 0
h < 0
h in <0:+oo)
((h^12.56)^1)/3 = 25.12 // - 25.12
((h^12.56)^1)/3-25.12 = 0
(h^12.56)/3-25.12 = 0
1/3*h^12.56 = 25.12 // : 1/3
h^12.56 = 75.36000075
h^12 = 75.36000075^(1/0.56) // ^ 1/12
abs(h) = 75.36000075^0.1488095182142857
h = 75.36000075^0.1488095182142857 or h = -75.36000075^0.1488095182142857
h in { -75.36000075^0.1488095182142857}
h = 75.36000075^0.1488095182142857
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