Trigonometry (11th Edition)
Trigonometry (11th Edition)
11th Edition
ISBN: 9780134217437
Author: Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher: PEARSON
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Simplify completely, make sure your angle is positive. 

9. cos(-20)cos(-e) + sin (-20) sin (-e)
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Transcribed Image Text:9. cos(-20)cos(-e) + sin (-20) sin (-e)
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