但是，随着角度增加到 360 度、720 度（4 pi 弧度）以及更大时，泰勒级数就逐渐需要更多条件来进行准确计算。
However as the angle increases to 360 degrees, 720 degrees (4 pi radians), and more, the Taylor series requires progressively more terms for accurate computation.
另外又指出矩阵幂级数是正规矩阵的条件。
We shall also point the condition that matrix power series is normal.
有学者已就清代级数论的一组初始条件作了不少解释，至于它被近代级数论完全取代的决定因素则未论及。
The initial conditions of Qing-times series have been explored by many scholars, however, the reasons why it was entirely replaced by modern series have not been discussed yet.
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