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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
y^2-(((4*y)/3)/y)-(4/4) = 0
y^2-4/3-1 = 0
1*y^2 = 7/3 // : 1
y^2 = 7/3
y^2 = 7/3 // ^ 1/2
abs(y) = (7/3)^(1/2)
y = (7/3)^(1/2) or y = -(7/3)^(1/2)
y in { (7/3)^(1/2), -(7/3)^(1/2) }
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