Answer
$(\frac{x}{2}+\frac{\pi}{4})$.
Work Step by Step
The argument of a trigonometric function is the input to the function, which here is $(\frac{x}{2}+\frac{\pi}{4})$.
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 4 - Section 4.4 - The Other Trigonometric Functions - 4.4 Problem Set - Page 229: 68
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