Answer
The identity $\tan \left( \alpha -\beta \right)$ is the difference between the tangent of the first angle and the tangent of the second angle divided by 1 plus the product of both angles.
Work Step by Step
Given above.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 5 - Section 5.2 - Sum and Difference Formulas - Exercise Set - Page 671: 85
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