Find and explain  the errors that have been made

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 40E
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Find and explain  the errors that have been made 

 

 

cos ()
17
12
= cos
+
6.
= CoS
COS
sin
Transcribed Image Text:cos () 17 12 = cos + 6. = CoS COS sin
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