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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
4/j = 2 // - 2
4/j-2 = 0
4*j^-1 = 2 // : 4
j^-1 = 1/2
-1 < 0
1/(j^1) = 1/2 // * j^1
1 = 1/2*j^1 // : 1/2
2 = j^1
j = 2
j = 2
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