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D( Y )
Y = 0
Y = 0
Y = 0
Y in (-oo:0) U (0:+oo)
0.54/Y = 1.62 // - 1.62
0.54/Y-1.62 = 0
0.54*Y^-1 = 1.62 // : 0.54
Y^-1 = 3
-1 < 0
1/(Y^1) = 3 // * Y^1
1 = 3*Y^1 // : 3
1/3 = Y^1
Y = 1/3
Y = 1/3
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