Answer:
E. x-coordinate of point C
Step-by-step explanation:
Consider the diagram of the unit circle which has been drawn and attached.
Using a calculator in radians, [tex]cos (\pi)=-1[/tex]
On the unit circle, out of points A, B and C, the point -1 is at point C.
Point C is located at (-1,0).
Therefore, [tex]cos (\pi)[/tex] is the x-coordinate of point C.
The correct option is E.
