5. If 90° < 0 < 180° and cos 0 = — 1, find cos 20. ㅇ 곯 ○ 16 25 0-곯 ㅇ

Trigonometry (MindTap Course List)
8th Edition
ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter3: Radian Measure
Section3.3: Definition Iii: Circular Functions
Problem 113PS
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5. If 90° < 0 < 180° and cos 0 = —음, find cos 20.
ㅇ 곯
16
○-풂
25
ㅇ-곯
O
Transcribed Image Text:5. If 90° < 0 < 180° and cos 0 = —음, find cos 20. ㅇ 곯 16 ○-풂 25 ㅇ-곯 O
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