Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 6 - Trigonometric Functions - 6.2 Trigonometric Functions: Unit Circle Approach - 6.2 Assess Your Understanding - Page 379: 88

Answer

$0$

Work Step by Step

Notice that $140=180-40$, we have: $tan40^\circ+tan140^\circ=tan40^\circ+tan(180-40)^\circ=tan40^\circ-tan40^\circ=0$
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