Question

28 28 28 28 28 28 28 28 28 28

Answer 1

we have the function

`y=(1)/(2)cos(2x)-1`

Verify each statement

Option A

Find out the period

The period is

Period=2pi/B

The Period goes from one peak to the next

B=2

Period=2pi/2

Period=pi

so

Statement A is not true

Option B

Find out the amplitude

Looking at the equation

Amplitude=1/2

so

Statement B is not true

Option C

Find out the midline

midline=(-1.5-0.5)/2=-1

Statement C is true

Option D

The domain of the function is the interval (-infinite, infinite) (all real numbers)

Statement D is not true

therefore

The answer is option C