Choose the function whose graph is Given by?

A.) y= 4cos(1/2x)

B.) y= 4cos(pi/2x)

C.) y=4cos(2x)

D.) y= -4cos(pi/2x)

Answer:- C.) y=4cos(2x)

The correct answer is ‘y=4cos(2x).’

The graph of y=4cos(2x) is a cosine function with a period of pi/2.

The graph of y=4cos(1/2x) is a cosine function with a period of 2pi.

The graph of y=4cos(pi/2x) is a cosine function with a period of pi.

The graph of y=-4cos(pi/2x) is a cosine function with a period of pi, but it is reflected across the y-axis.

The graph of y=-1 is a horizontal line.