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D( Y )
Y = 0
Y = 0
Y = 0
Y in (-oo:0) U (0:+oo)
(Y^-1)/2 = 6 // - 6
(Y^-1)/2-6 = 0
1/2*Y^-1 = 6 // : 1/2
Y^-1 = 12
-1 < 0
1/(Y^1) = 12 // * Y^1
1 = 12*Y^1 // : 12
1/12 = Y^1
Y = 1/12
Y = 1/12
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