数学试题讲解

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lim_{n \to \infty} \frac{π}{2 n^{4}} \sum_{i = 1}^{n} \sum_{j = 1}^{n} i^{2} \sin \frac{π j}{2 n} =

\frac{1}{2}

. B.

\frac{1}{3}

. C.

\frac{1}{4}

. D.

\frac{1}{5}