The cosine function normally has consecutive maximums at and . Your function has consecutive maximums at and . This means the period is , which is normal for the cosine function. So what is the phase shift when you move to ?
Give an equation for a cosine funtion that has a maximum at (pi/4, 8), followed immediately by another maximum at (9pi/4,8), and has a minimum at value of 4.
This is what I did
Amplitude = (8-4)/2
= 2
Vertical shift = 8-2 =6
So far I got this
y = 2cos (x -? )+6
How do I find the phase shift