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English: A geometric diagram for proof of the addition formula for cosines and the addition formula for sines. This is a standard geometric construction for those proof. The labels on this diagram match the labels on the video proving the addition formula at the CC-SA-BY-3.0 licensed trigonometry videos at www.khanacademy.org so that it can be more easily used in conjunction with that free courseware.
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Author JamesCrook

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31 October 2010

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Date/TimeThumbnailDimensionsUserComment
current22:32, 31 October 2010Thumbnail for version as of 22:32, 31 October 2010402 × 370 (22 KB)Ilmari Karonendelete empty <flowRoot> and <flowRegion> tags
20:49, 31 October 2010Thumbnail for version as of 20:49, 31 October 2010402 × 370 (22 KB)JamesCrook{{Information |Description={{en|1=A geometric diagram for proof of the addition formula for cosines and the addition formula for sines. This is a standard geometric construction for those proof. The labels on this diagram match the labels on the video p