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ScreenCapture 08 04 2020 13 17 48
Date: 2020-04-08 10:26:44
31-23 1012615 蔣順安
Channel: Shun-An Jiang
Date: 2013-05-05 04:35:18
ScreenCapture 20 07 10 22 52 23
Date: 2020-07-11 01:00:21
[0733] Calculus - Differentiation by First Principles - Example y=x³
Date: 2021-06-23 05:02:42
M2U02158
Channel: Convexa 2.0
Date: 2014-08-23 14:15:54