[積分] 積分時候需要證明積分的公式嗎?
剛剛看到上面有一題95台大C GAMMA 的題目
下面回應有寫到一句話
不能直接用工式的結果
那...
假設今天題目
(1+x^2)^(-1)
我需要去證明tan^(-1) 這個工式嗎?
還是說可以直接d{tan^(-1)}=(1+x^2)^(-1)dx
這樣代
不好意思我知道這樣已經有點太誇張了
可是真的越看覺得越怕被扣這種分
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