[微積] 弧長範圍
想請問課本這句話是什麼意思
為何t的定義範圍變成兩倍??
[moptt_image_upload:file:///storage/emulated/0/Pictures/MoPTT/capture_1491754236523.jpg result:http://i.imgur.com/JBBwOhz.jpg]
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