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