1. If 270° < 0 < 360° and cos 0 = 11 15 ! , find cos 20. 104 225 104 225 17 225
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:11
1. If 270° < 0 < 360° and cos O
find cos 20.
15 '
104
225
104
225
品
17
225
17
225
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