Chapter 1.6, Problem 22E

(a)

To determine

To find: The period of the function $y=\cos \pi x$ .

Answer to Problem 22E

The period of the function is $2$ .

Explanation of Solution

Given information:The given function is $y=\cos \pi x$ .

Calculation:

The period of a function $y=A\sin \left(Bx+C\right)+D$ is given by $\frac{2\pi }{B}$ .

Consider the given function $y=\cos \pi x$ . So, the period of the given function is:

  $\begin{array}{c}\frac{2\pi }{B}=\pi \\ =2\end{array}$

Therefore, the period of the function is $2$ .

(b)

To determine

To find: The amplitude of the function $y=\cos \pi x$ .

Answer to Problem 22E

The amplitude of the function is $1$ .

Explanation of Solution

Given information:The given function is $y=\cos \pi x$ .

Calculation:

The general form of sine function is:

  $y=A\sin \left(Bx+C\right)+D$

Here, $\left|A\right|$ is the amplitude.

The amplitude of the given function $y=\cos \pi x$ is:

  $\left|A\right|=1$

Therefore, theamplitude of the function is $1$ .

(c)

To determine

To find: The viewing window shown in the graph given.

Answer to Problem 22E

The viewing window for the given graph is $\left[-4,4\right]$ by $\left[-2,2\right]$ .

Explanation of Solution

Given information:The given function is $y=\cos \pi x$

and the graph is:

  

Calculation:

The function $y=\cos \pi x$ has a period of $2$ and it repeats its values twice to the right and twice to the left of origin in the given graph.

So, the value of $x$ lies between $-4$ and $4$ and as shown in graph the values of $y$ lies between $-2$ and $2$ .

Therefore, the viewing window for the given graph is $\left[-4,4\right]$ by $\left[-2,2\right]$ .