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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
4/3 = 8/u-2 // - 8/u-2
4/3-(8/u)+2 = 0
4/3-8*u^-1+2 = 0
-8*u^-1 = -10/3 // : -8
u^-1 = 5/12
-1 < 0
1/(u^1) = 5/12 // * u^1
1 = 5/12*u^1 // : 5/12
12/5 = u^1
u = 12/5
u = 12/5
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