推 squallting:π是常數 03/19 11:00
→ funtsung:∫xd((-1/π)*cosπx) = uv-∫vdu = 1/π ? 03/19 11:00
→ ruby791104:謝謝兩位大大，我懂了！感恩！（鞠躬 03/19 11:03
1
∫ xsinπx dx
0
（有π就覺得怪怪的囧！）
謝謝好心的大大囉！
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Don't walk behind me, I may not lead.
Walk beside me and be my friend.
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