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limn→∞1n(cosπn+cos2πn+⋯+cosnπn)= ? \large \lim_{n\to\infty} \dfrac1n \left( \cos \dfrac\pi n + \cos \dfrac{2\pi}n + \cdots + \cos \dfrac{n\pi}n \right) = \, ? n→∞limn1(cosnπ+cosn2π+⋯+cosnnπ)=?
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