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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
h-(6/h)+6 = 0
h-6*h^-1+6 = 0
1*h^1-6*h^-1+6*h^0 = 0
(1*h^2+6*h^1-6*h^0)/(h^1) = 0 // * h^2
h^1*(1*h^2+6*h^1-6*h^0) = 0
h^1
h^2+6*h-6 = 0
h^2+6*h-6 = 0
DELTA = 6^2-(-6*1*4)
DELTA = 60
DELTA > 0
h = (60^(1/2)-6)/(1*2) or h = (-60^(1/2)-6)/(1*2)
h = (2*15^(1/2)-6)/2 or h = (-2*15^(1/2)-6)/2
h in { (-2*15^(1/2)-6)/2, (2*15^(1/2)-6)/2}
h in { (-2*15^(1/2)-6)/2, (2*15^(1/2)-6)/2 }
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