Trigonometry (MindTap Course List)
8th Edition
ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter1: The Six Trigonometric Functions
Section1.4: Introduction To Identities
Problem 65PS
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Why is the answer negative for this half angle question ? How do you know if it’s positive or negative?
Transcribed Image Text:42. cos 157.5°
cos 315
土+Cos315°
·2
4
十
+1
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