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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
5*h-(6/h) = 0
5*h-6*h^-1 = 0
5*h^1-6*h^-1 = 0
(5*h^2-6*h^0)/(h^1) = 0 // * h^2
h^1*(5*h^2-6*h^0) = 0
h^1
5*h^2-6 = 0
5*h^2-6 = 0
DELTA = 0^2-(-6*4*5)
DELTA = 120
DELTA > 0
h = (120^(1/2)+0)/(2*5) or h = (0-120^(1/2))/(2*5)
h = (1*30^(1/2))/5 or h = (-30^(1/2))/5
h in { (-30^(1/2))/5, (1*30^(1/2))/5}
h in { (-30^(1/2))/5, (1*30^(1/2))/5 }
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