Answer
See below.
Work Step by Step
Using what we learned: $\sin90^\circ=1,\cos90^\circ=0,\frac{\sin90^\circ}{\cos90^\circ}=\frac{1}{0}$, 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 2 - Section 2.2 - Calculators and Trigonometric Functions of an Acute Angle - 2.2 Problem Set - Page 73: 91
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