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.
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 1 - Trigonometric Functions - Section 1.4 Using the Definitions of the Trigonometric Functions - 1.4 Exercises - Page 37: 26
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