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D( y )
y = 0
y^2 = 0
y = 0
y = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
(5*y)/y-(25/y)-5-5 = 250/(y^2)-25 // - 250/(y^2)-25
(5*y)/y-(25/y)-(250/(y^2))-5-5+25 = 0
(5*y)/y-25*y^-1-250*y^-2-5-5+25 = 0
20-25*y^-1-250*y^-2 = 0
t_1 = y^-1
20-250*t_1^2-25*t_1^1 = 0
20-250*t_1^2-25*t_1 = 0
DELTA = (-25)^2-(-250*4*20)
DELTA = 20625
DELTA > 0
t_1 = (20625^(1/2)+25)/(-250*2) or t_1 = (25-20625^(1/2))/(-250*2)
t_1 = (25*33^(1/2)+25)/(-500) or t_1 = (25-25*33^(1/2))/(-500)
t_1 = (25*33^(1/2)+25)/(-500)
y^-1-((25*33^(1/2)+25)/(-500)) = 0
1*y^-1 = (25*33^(1/2)+25)/(-500) // : 1
y^-1 = (25*33^(1/2)+25)/(-500)
-1 < 0
1/(y^1) = (25*33^(1/2)+25)/(-500) // * y^1
1 = ((25*33^(1/2)+25)/(-500))*y^1 // : (25*33^(1/2)+25)/(-500)
-500*(25*33^(1/2)+25)^-1 = y^1
y = -500*(25*33^(1/2)+25)^-1
t_1 = (25-25*33^(1/2))/(-500)
y^-1-((25-25*33^(1/2))/(-500)) = 0
1*y^-1 = (25-25*33^(1/2))/(-500) // : 1
y^-1 = (25-25*33^(1/2))/(-500)
-1 < 0
1/(y^1) = (25-25*33^(1/2))/(-500) // * y^1
1 = ((25-25*33^(1/2))/(-500))*y^1 // : (25-25*33^(1/2))/(-500)
-500*(25-25*33^(1/2))^-1 = y^1
y = -500*(25-25*33^(1/2))^-1
y in { -500*(25*33^(1/2)+25)^-1, -500*(25-25*33^(1/2))^-1 }
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