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-(x+1) (e1/(x+1) - 1)

-(x+1) {1 + 1/(x+1) + 1/(x+1)+ 1/(x+1)+ .................-1}       (expand e1/(x+1))

-{1 + 1/(x+1) + 1/(x+1)+ 1/(x+1)+ .................}

now take limit we got -1

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