Answer
See below.
Work Step by Step
From what we learned: $\sin90^\circ=1,\cos90^\circ=0,\tan90^\circ=\frac{\sin90^\circ}{\cos90^\circ}=\frac{1}{0}$, which is undefined
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 1 - Test - Page 51: 14
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