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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)
8/y-(2/y)+3+3 = 12/(y^2)-9 // - 12/(y^2)-9
8/y-(2/y)-(12/(y^2))+3+3+9 = 0
8/y-2*y^-1-12*y^-2+3+3+9 = 0
6*y^-1-12*y^-2+15 = 0
t_1 = y^-1
6*t_1^1-12*t_1^2+15 = 0
6*t_1-12*t_1^2+15 = 0
DELTA = 6^2-(-12*4*15)
DELTA = 756
DELTA > 0
t_1 = (756^(1/2)-6)/(-12*2) or t_1 = (-756^(1/2)-6)/(-12*2)
t_1 = (6*21^(1/2)-6)/(-24) or t_1 = (-6*21^(1/2)-6)/(-24)
t_1 = (6*21^(1/2)-6)/(-24)
y^-1-((6*21^(1/2)-6)/(-24)) = 0
1*y^-1 = (6*21^(1/2)-6)/(-24) // : 1
y^-1 = (6*21^(1/2)-6)/(-24)
-1 < 0
1/(y^1) = (6*21^(1/2)-6)/(-24) // * y^1
1 = ((6*21^(1/2)-6)/(-24))*y^1 // : (6*21^(1/2)-6)/(-24)
-24*(6*21^(1/2)-6)^-1 = y^1
y = -24*(6*21^(1/2)-6)^-1
t_1 = (-6*21^(1/2)-6)/(-24)
y^-1-((-6*21^(1/2)-6)/(-24)) = 0
1*y^-1 = (-6*21^(1/2)-6)/(-24) // : 1
y^-1 = (-6*21^(1/2)-6)/(-24)
-1 < 0
1/(y^1) = (-6*21^(1/2)-6)/(-24) // * y^1
1 = ((-6*21^(1/2)-6)/(-24))*y^1 // : (-6*21^(1/2)-6)/(-24)
-24*(-6*21^(1/2)-6)^-1 = y^1
y = -24*(-6*21^(1/2)-6)^-1
y in { -24*(6*21^(1/2)-6)^-1, -24*(-6*21^(1/2)-6)^-1 }
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