Answer
$-1$
Work Step by Step
The tangent is an odd function so
$\tan{(- \theta)}= - \tan{\theta}$
Thus,
$\tan{\left(-\dfrac{ \pi}{4} \right) } = - \tan{\left(\dfrac{ \pi}{4} \right) } = \boxed{-1}$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 5 - Trigonometric Functions - Section 5.3 Properties of the Trigonometric Functions - 5.3 Assess Your Understanding - Page 418: 67
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