Explain two different methods of calculating cos(195°)cos(105°), one of which uses the product to sum. Which method is easier?

Chapter 7, 7.4 Exercises #2

Explain two different methods of calculating cos(195°)cos(105°), one of which uses the product to sum. Which method is easier?

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Related Book For answer-question

Precalculus

1st Edition

Authors: Jay Abramson

ISBN: 9781938168345