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How to find the limit correctly?

Mathematica Asked on January 9, 2021

I want to use MMA to find the limit of $lim _{n rightarrow infty}left(frac{sin frac{pi}{n}}{n+1}+frac{sin frac{2 pi}{n}}{n+frac{1}{2}}+cdots+frac{sin pi}{n+frac{1}{n}}right)$.

Limit[Sum[Sin[(i*Pi)/n]/(n + 1/i), {i, 1, n}], n -> Infinity]

However, the above code does not get the correct result (the answer is $frac{2}{pi}$).

What can I do to get the right results?

One Answer

The recent command of Mathematica

AsymptoticSum[Sin[(i*Pi)/n]/(n + 1/i), {i, 1, n}, {n, Infinity, 1}]
(*2/[Pi]*)

does the job.

Correct answer by user64494 on January 9, 2021

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