Use the sum and difference identities to evaluate exactly. Then check using a graphing calculator. cos 15
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Use the sum and difference identities to evaluate exactly. Then check using a graphing calculator.
cos 15°
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Related Book For 
Algebra And Trigonometry Graphs And Models
ISBN: 9780134179049
6th Edition
Authors: Marvin Bittinger, Judith Beecher, David Ellenbogen, Judith Penna
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