Notice how the arrows on the mapping diagrams are paired with the points on the graph of the functions.
You can move the point for $x$ on the mapping diagram to see how the function value for the function $f(x) = \sin(x) $ or $g(x) = \cos(x)$ changes both on the diagram and on the graph.

Check the upper box to show points on the graph and arrows on the diagram for the function $f(x) = \sin(x)$ related to the data in the table.
Check the lower box to show the graph and arrows on the diagram for the function $g(x) = \cos(x)$.

Leave the upper box checked to see some of the relationship between the graphs and mapping diagrams of the sine and cosine functions.