😃9.3 正弦與餘弦傅立葉級數

偶函數(even function)

https://www.geogebra.org/m/A5S7naz3

奇函數(odd function)

https://www.geogebra.org/m/GY9tNvfB

https://www.geogebra.org/m/me6nTSeZ

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

https://www.geogebra.org/m/x8ymgfph

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