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D( j )
j-1 = 0
j-1 = 0
j-1 = 0
j-1 = 0 // + 1
j = 1
j in (-oo:1) U (1:+oo)
2*j*(2/(j-1)) = 0
(2*2*j)/(j-1) = 0
2*j = 0 // : 2
j = 0
j = 0
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