A. tan(x - 2) = tan x
B. cos(x + y) - cos(x - y) = 2 cosxcosy
C. cos(x+y)+ cos(- y) = 2cos x cosy
D. sin(x + y) + sin(x - y) = 2cosx siny

i say b hope this jdjdjdj

a

step-by-step explanation:

h is the x-coordinate of the vertex

step-by-step explanation:

we have

in this function

the point represent the vertex of the function

so

h is the x-coordinate of the vertex

k is the y-coordinate of the vertex