For the following exercises, prove the identities provided. cos(x + y)cos(x − y) = cos 2 x − sin 2 y

Chapter 7, 7.2 Exercises #50

For the following exercises, prove the identities provided.

cos(x + y)cos(x − y) = cos2 x − sin2 y

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Related Book For answer-question

Precalculus

1st Edition

Authors: Jay Abramson

ISBN: 9781938168345