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If ("lim")(xvec1^-)(2-x+a[x-1]+b[1+x]) e...

If `("lim")_(xvec1^-)(2-x+a[x-1]+b[1+x])` exists, then `aa n db` can take the values of (where [.] denotes the greatest integer function). `a=1/3,b=1` `a=1, b=-1` `a=9, b=-9` `a=2, b=2/3`

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