b2 + c2 – a² cos A = 2bc a? +c2 – b2 cos B = 2ас
Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE:
1. Give the measures of the complement and the supplement of an angle measuring 35°.
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
Transcribed Image Text:5 (C) A student asks how you prove the other 2 versions of the Law of Cosines found in
equations (5.9) and (5.10). How do you do it?
b² + c² – a²
cos A =
(5.9)
2bc
a² + c2 – b2
Cos B =
(5.10)
2ac
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