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【全pornhub最大華人微積分教學頻道】【張旭微積分】微分應用篇重點四：微分求極值法｜觀念講解｜2020版

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Description:	The video you are currently watching is titled "【全pornhub最大華人微積分教學頻道】【張旭微積分】微分應用篇重點四：微分求極值法｜觀念講解｜2020版." It was added on 3 months ago from redtube. It's exactly 50:52 long, and was uploaded by Youjizz.
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