At
t = 0, d = 0
t = 1, d = 3.07
t = 2, d = 6
t = 3, d = 10
t = 4, d = 14
t = 5, d = 16.93
t = 6, d = 18
t = 7, d = 16.93
t = 8, d = 14
t = 9, d = 10
t = 10, d = 6
t = 11, d = 3.07
The equation is:
In degrees:
y = 10 - 8 cos 30x
In radians
y = 10 - 8 cos πx/6