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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(2*(y^2-36))/y-6 = 0
(2*(y^2-36))/y+(-6*y)/y = 0
2*(y^2-36)-6*y = 0
2*y^2-6*y-72 = 0
2*y^2-6*y-72 = 0
2*(y^2-3*y-36) = 0
y^2-3*y-36 = 0
DELTA = (-3)^2-(-36*1*4)
DELTA = 153
DELTA > 0
y = (153^(1/2)+3)/(1*2) or y = (3-153^(1/2))/(1*2)
y = (3*17^(1/2)+3)/2 or y = (3-3*17^(1/2))/2
2*(y-((3-3*17^(1/2))/2))*(y-((3*17^(1/2)+3)/2)) = 0
(2*(y-((3-3*17^(1/2))/2))*(y-((3*17^(1/2)+3)/2)))/y = 0
(2*(y-((3-3*17^(1/2))/2))*(y-((3*17^(1/2)+3)/2)))/y = 0 // * y
2*(y-((3-3*17^(1/2))/2))*(y-((3*17^(1/2)+3)/2)) = 0
( 2 )
2 = 0
y belongs to the empty set
( y-((3*17^(1/2)+3)/2) )
y-((3*17^(1/2)+3)/2) = 0 // + (3*17^(1/2)+3)/2
y = (3*17^(1/2)+3)/2
( y-((3-3*17^(1/2))/2) )
y-((3-3*17^(1/2))/2) = 0 // + (3-3*17^(1/2))/2
y = (3-3*17^(1/2))/2
y in { (3*17^(1/2)+3)/2, (3-3*17^(1/2))/2 }
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