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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)
1/y-(6/y)-4+4 = 12/(y^2)-16 // - 12/(y^2)-16
1/y-(6/y)-(12/(y^2))-4+4+16 = 0
1/y-6*y^-1-12*y^-2-4+4+16 = 0
16-5*y^-1-12*y^-2 = 0
t_1 = y^-1
16-12*t_1^2-5*t_1^1 = 0
16-12*t_1^2-5*t_1 = 0
DELTA = (-5)^2-(-12*4*16)
DELTA = 793
DELTA > 0
t_1 = (793^(1/2)+5)/(-12*2) or t_1 = (5-793^(1/2))/(-12*2)
t_1 = (793^(1/2)+5)/(-24) or t_1 = (5-793^(1/2))/(-24)
t_1 = (793^(1/2)+5)/(-24)
y^-1-((793^(1/2)+5)/(-24)) = 0
1*y^-1 = (793^(1/2)+5)/(-24) // : 1
y^-1 = (793^(1/2)+5)/(-24)
-1 < 0
1/(y^1) = (793^(1/2)+5)/(-24) // * y^1
1 = ((793^(1/2)+5)/(-24))*y^1 // : (793^(1/2)+5)/(-24)
-24*(793^(1/2)+5)^-1 = y^1
y = -24*(793^(1/2)+5)^-1
t_1 = (5-793^(1/2))/(-24)
y^-1-((5-793^(1/2))/(-24)) = 0
1*y^-1 = (5-793^(1/2))/(-24) // : 1
y^-1 = (5-793^(1/2))/(-24)
-1 < 0
1/(y^1) = (5-793^(1/2))/(-24) // * y^1
1 = ((5-793^(1/2))/(-24))*y^1 // : (5-793^(1/2))/(-24)
-24*(5-793^(1/2))^-1 = y^1
y = -24*(5-793^(1/2))^-1
y in { -24*(793^(1/2)+5)^-1, -24*(5-793^(1/2))^-1 }
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