arctan 5 7

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Sheihuimin, Yun, Yi-Huai, Chanding-bian compilation of mathematical Analysis exercises Lecture notes section 16.2 exercises reference answers [from Tao younger brother]

Label:1. Set the known $\sum\limits_{n = 1}^\infty {{{\left ({-1} \right)}^{n-1}}{a_n}} = A,\sum\limits_{n = 1}^\infty {{a_{2n-1 }}} = B$, proof: $\sum\limits_{n = 1}^\infty {{A_n}}$ converge and ask for and.Solution: There is