File:正弦二倍角公式證明圖.jpg

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中文（臺灣）：正弦二倍角公式證明圖
Date
Source 張景中 (2007) 數學家的眼光, 中國少年兒童新聞出版總社, pp. 23 ISBN: 978-7-5007-8657-3.
Author 張景中
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This logo image consists only of simple geometric shapes or text. It does not meet the threshold of originality needed for copyright protection, and is therefore in the public domain. Although it is free of copyright restrictions, this image may still be subject to other restrictions. See WP:PD § Fonts and typefaces or Template talk:PD-textlogo for more information.

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2017-04-08 17:47 1938×1364× (149194 bytes) Wcam threshold

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current01:41, 23 April 2017Thumbnail for version as of 01:41, 23 April 20171,938 × 1,364 (146 KB)Taiwania Justo (talk | contribs)Transferred from zh.wikipedia

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