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Let L=lim(nrarroo)inta^oo (ndx)/(1+n^2x^...

Let `L=lim_(nrarroo)int_a^oo (ndx)/(1+n^2x^2)` where `a in R` then `cos L` can be (A) `-1` (B) `0` (C) `1` (D) `1/2`

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