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D( y )
y = 0
2*y-8 = 0
y = 0
y = 0
2*y-8 = 0
2*y-8 = 0
2*y-8 = 0 // + 8
2*y = 8 // : 2
y = 8/2
y = 4
y in (-oo:0) U (0:4) U (4:+oo)
1/(2*y-8)+4 = -2/y-4 // + -2/y-4
1/(2*y-8)-(-2/y)+4+4 = 0
1/(2*y-8)+2*y^-1+4+4 = 0
1/(2*y-8)+2/y+4+4 = 0
(1*y)/(y*(2*y-8))+(2*(2*y-8))/(y*(2*y-8))+(4*y*(2*y-8))/(y*(2*y-8))+(4*y*(2*y-8))/(y*(2*y-8)) = 0
2*(2*y-8)+4*y*(2*y-8)+4*y*(2*y-8)+1*y = 0
8*y^2+8*y^2+5*y-32*y-32*y-16 = 0
8*y^2+8*y^2-27*y-32*y-16 = 0
16*y^2-59*y-16 = 0
16*y^2-59*y-16 = 0
16*y^2-59*y-16 = 0
DELTA = (-59)^2-(-16*4*16)
DELTA = 4505
DELTA > 0
y = (4505^(1/2)+59)/(2*16) or y = (59-4505^(1/2))/(2*16)
y = (4505^(1/2)+59)/32 or y = (59-4505^(1/2))/32
(y-((59-4505^(1/2))/32))*(y-((4505^(1/2)+59)/32)) = 0
((y-((59-4505^(1/2))/32))*(y-((4505^(1/2)+59)/32)))/(y*(2*y-8)) = 0
((y-((59-4505^(1/2))/32))*(y-((4505^(1/2)+59)/32)))/(y*(2*y-8)) = 0 // * y*(2*y-8)
(y-((59-4505^(1/2))/32))*(y-((4505^(1/2)+59)/32)) = 0
( y-((4505^(1/2)+59)/32) )
y-((4505^(1/2)+59)/32) = 0 // + (4505^(1/2)+59)/32
y = (4505^(1/2)+59)/32
( y-((59-4505^(1/2))/32) )
y-((59-4505^(1/2))/32) = 0 // + (59-4505^(1/2))/32
y = (59-4505^(1/2))/32
y in { (4505^(1/2)+59)/32, (59-4505^(1/2))/32 }
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