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Geometrica Proof of a Trigonometrical Identity
Published online by Cambridge University Press: 31 October 2008
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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.
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- Copyright © Edinburgh Mathematical Society 1915
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