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