
[工數] 積分

這題我用殘值算計算過程如下
https://i.imgur.com/NiIEWHB.jpg

算出來和解答差一個pi....
請問哪裡錯了?!
看不太懂答案怎麼積的
謝謝!!
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推
06/15 23:32, , 1F
06/15 23:32, 1F
→
06/15 23:35, , 2F
06/15 23:35, 2F
推
06/16 00:37, , 3F
06/16 00:37, 3F
→
06/16 00:40, , 4F
06/16 00:40, 4F
→
06/16 01:23, , 5F
06/16 01:23, 5F
→
06/16 01:24, , 6F
06/16 01:24, 6F
→
06/16 01:26, , 7F
06/16 01:26, 7F
→
06/16 01:27, , 8F
06/16 01:27, 8F
→
06/16 01:29, , 9F
06/16 01:29, 9F
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