Geometrica Proof of a Trigonometrical Identity
Burgess, A. G.
Журнал:
Mathematical Notes
Дата:
1915
Аннотация:
The following proof of the identityWhere 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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