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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)
9/y-(3/y)-2+2 = 12/(y^2)-4 // - 12/(y^2)-4
9/y-(3/y)-(12/(y^2))-2+2+4 = 0
9/y-3*y^-1-12*y^-2-2+2+4 = 0
6*y^-1-12*y^-2+4 = 0
t_1 = y^-1
6*t_1^1-12*t_1^2+4 = 0
6*t_1-12*t_1^2+4 = 0
DELTA = 6^2-(-12*4*4)
DELTA = 228
DELTA > 0
t_1 = (228^(1/2)-6)/(-12*2) or t_1 = (-228^(1/2)-6)/(-12*2)
t_1 = (2*57^(1/2)-6)/(-24) or t_1 = (-2*57^(1/2)-6)/(-24)
t_1 = (2*57^(1/2)-6)/(-24)
y^-1-((2*57^(1/2)-6)/(-24)) = 0
1*y^-1 = (2*57^(1/2)-6)/(-24) // : 1
y^-1 = (2*57^(1/2)-6)/(-24)
-1 < 0
1/(y^1) = (2*57^(1/2)-6)/(-24) // * y^1
1 = ((2*57^(1/2)-6)/(-24))*y^1 // : (2*57^(1/2)-6)/(-24)
-24*(2*57^(1/2)-6)^-1 = y^1
y = -24*(2*57^(1/2)-6)^-1
t_1 = (-2*57^(1/2)-6)/(-24)
y^-1-((-2*57^(1/2)-6)/(-24)) = 0
1*y^-1 = (-2*57^(1/2)-6)/(-24) // : 1
y^-1 = (-2*57^(1/2)-6)/(-24)
-1 < 0
1/(y^1) = (-2*57^(1/2)-6)/(-24) // * y^1
1 = ((-2*57^(1/2)-6)/(-24))*y^1 // : (-2*57^(1/2)-6)/(-24)
-24*(-2*57^(1/2)-6)^-1 = y^1
y = -24*(-2*57^(1/2)-6)^-1
y in { -24*(2*57^(1/2)-6)^-1, -24*(-2*57^(1/2)-6)^-1 }
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