1 7. If A and B are positive acute angles and cos A = 13 then show 14' 7, cos B = that A- B = 60°.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section: Chapter Questions
Problem 17T
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Question
7. If A and B are positive acute angles and cos A =
1
cos B =
13
then show
that A- B = 60°.
14'
Transcribed Image Text:7. If A and B are positive acute angles and cos A = 1 cos B = 13 then show that A- B = 60°. 14'
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