Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 1 - Trigonometric Functions - Section 1.4 Using the Definitions of the Trigonometric Functions - 1.4 Exercises: 17

Answer

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Work Step by Step

While $\tan\theta =\frac{1}{\cot\theta}$, in this case cotangent of 90 is zero. This means that the tangent of 90 is undefined.
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