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

question 30

Multiple Choice

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.​ $$f ( x ) = 2 ^ { - \frac { x } { 4 } } \cos x$$

• A)​ As x → ∞,f(x)→ 0.
• B)​ As x → ∞,f(x)→ 0.
• C) As x → ∞,f(x)→ 0.
• D)​ The function f(x)is unbounded as x → ∞.
• E)​ The function f(x)is unbounded as x → ∞.