這甚麼恐怖的函數啊？奇函數與偶函數的積分，黑筆紅筆聖誕積分派對(ft.

[@diverQQ000]

那這樣只要是奇函數的積分都可以套用這方法嗎

[@GummyOuo]

反正我想不到，太難了

[@dextertu3386]

按照note寫的，為什麼帶入-x後的分母是1+笑臉分之一而不是1減笑臉？

[@nktsun98]

這題奇函數在指數上面，代入後變負指數

[@octopuskeng]

因為奇寒數在指數那邊，所以應該是倒數

[@dextertu3386]

理解了，謝謝各路大佬

[@dnd2008yi]

It's 1/3 in 30s 🗿

[@miaria-g7d]

let u = -x, 2I = 0, I = 0

[@政杰李-h5k]

啥呀

[@khoozu7802]

King property

[@raghvendrasingh1289]

if g(x)+g(-x) = 1 and f(x) is an even function
then integral of f(x) g(x) in [ - a , a ] = integral of f(x) in [ 0 , a ]