Answer:
The effect of
on the graph is it shift the graph horizontally.
Explanation:
Given : Function

To find : What effect
does have on the basic graph?
Solution :
Consider the parent function

The graph get transformed into

When there is a change in the x value then horizontal shift happened.
The general form of cosine is

The horizontal shift in this function is C.
Similarly, If we applied in
then there is a horizontal shift of

Therefore, The effect of
on the graph is it shift the graph horizontally.