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Geometrical Proof of a Trigonometrical Identity
Published online by Cambridge University Press: 31 October 2008
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The following method of proof of the identity,
where A, B, C are the angles of a triangle, was proposed in an examination paper, and it has been suggested to me that it might be of interest to teachers. It is rather easier than that given on p. 344 of “New Trigonometry for Schools” by Lock and Child.
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- Copyright © Edinburgh Mathematical Society 1915
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