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D( h )
7*h+1 = 0
7*h+1 = 0
7*h+1 = 0
7*h+1 = 0 // - 1
7*h = -1 // : 7
h = -1/7
h in (-oo:-1/7) U (-1/7:+oo)
7*h-(1/(7*h+1)) = 5/8 // - 5/8
7*h-(1/(7*h+1))-(5/8) = 0
7*h-(7*h+1)^-1-5/8 = 0
7*h-1/(7*h+1)-5/8 = 0
(-1*8)/(8*(7*h+1))+(7*8*h*(7*h+1))/(8*(7*h+1))+(-5*(7*h+1))/(8*(7*h+1)) = 0
7*8*h*(7*h+1)-5*(7*h+1)-1*8 = 0
392*h^2+56*h-35*h-8-5 = 0
392*h^2+21*h-13 = 0
392*h^2+21*h-13 = 0
392*h^2+21*h-13 = 0
DELTA = 21^2-(-13*4*392)
DELTA = 20825
DELTA > 0
h = (20825^(1/2)-21)/(2*392) or h = (-20825^(1/2)-21)/(2*392)
h = (35*17^(1/2)-21)/784 or h = (-35*17^(1/2)-21)/784
(h-((-35*17^(1/2)-21)/784))*(h-((35*17^(1/2)-21)/784)) = 0
((h-((-35*17^(1/2)-21)/784))*(h-((35*17^(1/2)-21)/784)))/(8*(7*h+1)) = 0
((h-((-35*17^(1/2)-21)/784))*(h-((35*17^(1/2)-21)/784)))/(8*(7*h+1)) = 0 // * 8*(7*h+1)
(h-((-35*17^(1/2)-21)/784))*(h-((35*17^(1/2)-21)/784)) = 0
( h-((-35*17^(1/2)-21)/784) )
h-((-35*17^(1/2)-21)/784) = 0 // + (-35*17^(1/2)-21)/784
h = (-35*17^(1/2)-21)/784
( h-((35*17^(1/2)-21)/784) )
h-((35*17^(1/2)-21)/784) = 0 // + (35*17^(1/2)-21)/784
h = (35*17^(1/2)-21)/784
h in { (-35*17^(1/2)-21)/784, (35*17^(1/2)-21)/784 }
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