Answer
$6,\ 720^\circ$.
See the graph below.
Work Step by Step
For the equation
$$
y=6\cos \frac{1}{2}x
$$
the amplitude is $6$ and the period is $P=\frac{360}{1/2}=720^\circ$.
See the graph below.
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 14 - Section 14.2 - Period and Phase Shift - Exercise - Page 484: 7
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