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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(96/y)/y = 4 // - 4
(96/y)/y-4 = 0
96*y^-2 = 4 // : 96
y^-2 = 1/24
-2 < 0
1/(y^2) = 1/24 // * y^2
1 = 1/24*y^2 // : 1/24
24 = y^2
y^2 = 24 // ^ 1/2
abs(y) = 2*6^(1/2)
y = 2*6^(1/2) or y = -(2*6^(1/2))
y in { 2*6^(1/2), -(2*6^(1/2)) }
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