... 定义,是可去间断点,从延拓意义上讲,收敛域也可认为是[ -1,1 ] .例 16.10 设 1 + ... dx 1 ( arctanx ) = = 1 + x2 2 ∞ Σ ( −1 ) " x2 " , │x | < 1 , n = 0 dt = 1 ...
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