😀9.1 預備知識

9-1.1 泰勒級數

https://www.geogebra.org/m/uS55uZKq
https://www.geogebra.org/m/MEHMVMPq
https://www.geogebra.org/m/ecvk9kzm

9-1.2 週期函數

https://www.geogebra.org/m/QRmStjFg
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