1.

The sum of the series (x-1)/(x+1)+1/2(x^(2)-1)/((x+1)^(2)+1/3(x^(3)-1)/(x+1)^(3)+…is equal to

Answer»

`log_(e)X`
`2 log_(e)x`
`-log_(e)(x+1)`
NONE of these

Answer :a


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