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D( Y )
Y = 0
Y = 0
Y = 0
Y in (-oo:0) U (0:+oo)
(Y^-1)/2 = 2 // - 2
(Y^-1)/2-2 = 0
1/2*Y^-1 = 2 // : 1/2
Y^-1 = 4
-1 < 0
1/(Y^1) = 4 // * Y^1
1 = 4*Y^1 // : 4
1/4 = Y^1
Y = 1/4
Y = 1/4
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