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Given that cos(0) = 2/13 18, and 0 is in Quadrant IV, what is cos(20)? %3D

Given that cos(0) = 2/13 18, and 0 is in Quadrant IV, what is cos(20)? %3D

Algebra & Trigonometry with Analytic Geometry
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.2: Graphs Of Equations
Problem 45E
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27/SPRINGTTRADIS ical Geometry I Courses MAC 2311/LEC/HY01-2021/SPRING/TRADITION January 14-January 20 Given that cos(0) 2/13 and 0 is in Quadrant IV, what is cos(20)? 13 Select the correct answer below: a search hp
Transcribed Image Text:27/SPRINGTTRADIS ical Geometry I Courses MAC 2311/LEC/HY01-2021/SPRING/TRADITION January 14-January 20 Given that cos(0) 2/13 and 0 is in Quadrant IV, what is cos(20)? 13 Select the correct answer below: a search hp
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Transcribed Image Text:cal Geometry Courses MAC 2311/LEC/HY01-2021/SPRING/TRADITION January 14-Januar a e to search hp
Expert Solution
Step 1

We can use the following standard trigonometric identity given below:

cos(2θ)=2cos2(θ)-1......(i)

Also, we are given that:

cos(θ)=21313=213......(ii)

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