I’m coming across the same problem I’ve had to ask several times. How do we get cos^-1(7/9)=38.94? I’ve tried this several times on my calculator and I’m getting .67967. 11:34Expert AnswerStep1а)The given triangle is right triangle.and a = 7 and c= 9 is the hypotenuse.Step2b)From given figure, it is observed that,Adjacent sidecos B=Нурotenuse().В-cos-1B=38. 94°

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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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I’m coming across the same problem I’ve had to ask several times. How do we get cos^-1(7/9)=38.94? I’ve tried this several times on my calculator and I’m getting .67967.

11:34
Expert Answer
Step1
а)
The given triangle is right triangle.
and a = 7 and c= 9 is the hypotenuse.
Step2
b)
From given figure, it is observed that,
Adjacent side
cos B=
Нурotenuse
().
В-cos-1
B=38. 94°

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