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Geometrica Proof of a Trigonometrical Identity

Published online by Cambridge University Press:  31 October 2008

A. G. Burgess
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The following proof of the identity

Where A, B, C are the angles of a triangle differs from that given by Dr Bell in the last number of Mathematical Notes and from that given in “New Trigonometry for Schools” by Lock and Child in that the area of the triangle is made use of.

Type
Research Article
Information
Edinburgh Mathematical Notes , Volume 18 , May 1915 , pp. 201 - 202
Copyright
Copyright © Edinburgh Mathematical Society 1915