What is the vertical displacement of the basic graph to produce a graph of ? y=-2-cos(x-pi)

a. pi units down
b. 2 units down
c. pi units up
d. 3 units down

Y = a sin b(x±h) ± k 
a : amplitude - take absolute value  
k : mid. line or vertical shift (+ up, - down) 
period = 2π/b
h : horizontal shift (phase shift). (+ left, - right) 
b : angular frequency

The correct answer to this question is B. 2 units down. This is the vertical displacement of the basic graph to produce a graph of y=-2-cos(x-pi). 

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