Question

Use the method of adding y-coordinates to graph each function.

$f\left(x\right)=\cos \left(2x\right)+\cos x$

Short answer

The required graph is

Step-by-step solution

Step 1. Given Information 

The given function is$f\left(x\right)=\cos \left(2x\right)+\cos x$

Step 2. Explanation

Select different values for x to plot the points on the graph of y.

Step 3. Graph 

Plot the graph by using the points in the table.