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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
1/u = 5/30 // - 5/30
1/u-(5/30) = 0
1/u-1/6 = 0
1*u^-1 = 1/6 // : 1
u^-1 = 1/6
-1 < 0
1/(u^1) = 1/6 // * u^1
1 = 1/6*u^1 // : 1/6
6 = u^1
u = 6
u = 6
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