Answer to Question #146202 in Trigonometry for Raffy

Question #146202
Establish two formulas using Napier’s rules I and II if side a is taken as the middle part.
1
Expert's answer
2020-11-29T15:48:19-0500

Taking a as the center b Bc will be adjacent to a while Ac and Cc will be opposite to a .

  1. Sin - Cop rule

Sin a = Cos Ac .Cos CC

2 .Sin - tanad rule

Sin a = tan b .tan Bc

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