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D( Y )
Y = 0
Y = 0
Y = 0
Y in (-oo:0) U (0:+oo)
5/Y = 9/8 // - 9/8
5/Y-(9/8) = 0
5/Y-9/8 = 0
5*Y^-1 = 9/8 // : 5
Y^-1 = 9/40
-1 < 0
1/(Y^1) = 9/40 // * Y^1
1 = 9/40*Y^1 // : 9/40
40/9 = Y^1
Y = 40/9
Y = 40/9
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