Use a Graphing Utility to Select the Graph the Damping $f ( x ) = 2 ^ { - \frac { x } { 4 } } \cdot \cos x$

Short Answer

Use a graphing utility to select the graph the damping factor and the function below in the same viewing window. Describe the behavior of the function as x increases without bound.
​ $f ( x ) = 2 ^ { - \frac { x } { 4 } } \cdot \cos x$