The graph of the function f(x) = 5 cos (2x) is a reflection over the x-axis of the graph of g(x) =

Step-by-step explanation:

The given function is

If a function reflected over the x-axis, then x-coordinate remains same but the sign of y-coordinate is changed.

If function f(x) is a reflection over the x-axis to get the of g(x), then the resultant function is

Substituting the value of function f(x), we get

Therefore, the required function is .