A cosine function is a reflection of its parent function over the x-axis. The amplitude of the function is 11, the vertical shift is 9 units down, and the period of the function is 7pi/12. The graph of the function does not show a phase shift. What is the equation of the cosine function described?

Fill in the blanks using values from this list: -20, -11, -9, -2, 2, 9, 11, 20, 7pi/12,12pi/7,7/24,24/7

f(x)=___cos(x)

We have been given that a cosine function is a reflection of its parent function over the x-axis. The amplitude of the function is 11, the vertical shift is 9 units down, and the period of the function is . The graph of the function does not show a phase shift. We are asked to write the equation of our function.

We know that general form a cosine function is , where,

A = Amplitude,

= Period,

c = Horizontal shift,

d = Vertical shift.    

The equation of parent cosine function is . Since function is reflected about x-axis, so our function will be .

Let us find the value of b.

Upon substituting our given values in general cosine function, we will get:

Therefore, our required function would be .

me

step-by-step explanation:

a c

step-by-step explanation: