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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
2*h-(3/h) = 0
2*h-3*h^-1 = 0
2*h^1-3*h^-1 = 0
(2*h^2-3*h^0)/(h^1) = 0 // * h^2
h^1*(2*h^2-3*h^0) = 0
h^1
2*h^2-3 = 0
2*h^2-3 = 0
DELTA = 0^2-(-3*2*4)
DELTA = 24
DELTA > 0
h = (24^(1/2)+0)/(2*2) or h = (0-24^(1/2))/(2*2)
h = (1*6^(1/2))/2 or h = (-6^(1/2))/2
h in { (-6^(1/2))/2, (1*6^(1/2))/2}
h in { (-6^(1/2))/2, (1*6^(1/2))/2 }
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