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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
1/u-3 = 3 // - 3
1/u-3-3 = 0
1*u^-1 = 6 // : 1
u^-1 = 6
-1 < 0
1/(u^1) = 6 // * u^1
1 = 6*u^1 // : 6
1/6 = u^1
u = 1/6
u = 1/6
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