Chapter 6.4, Problem 8MCQ

To determine

To graph: the function.

Explanation of Solution

Given information:

  $y=\cos x\left[\text{where }7\pi \le x\le 9\pi \right]$

Calculation:

Substitute $x$ values into the given equation to acquire $y$ values; then create a table of values between $7\pi \le x\le 9\pi$ as shown below.

$x$	$7\pi$	$7.5\pi$	$8\pi$	$8.5\pi$	$9\pi$
$y$	0.927	0.916	0.905	0.893	0.881

Now pair up the respective $x$ and $y$ values to form coordinate points. Plot the coordinate points and connect the points to create the graphed function.