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("lim")(xvec1)((x^4+x^2+x+1)/(x^2-x+1))^...

`("lim")_(xvec1)((x^4+x^2+x+1)/(x^2-x+1))^(1-"cos"(x+1))/((x+1)^(2))i se q u a lto` `1` (b) `(2/3)^(1/2)` (c) `(3/2)^(1/2)` (d) `e^(1/2)`

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