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