Answer:
y = 4sin((t+4Ï€/3)/2) -2
Step-by-step explanation:
The generic form is  y = A·sin(B(t -C)) +D Â
where  A is the amplitude
B is 2Ï€/period
C is the phase shift
D is the vertical shift
You have  A = 4
period = 4Ï€, so B = (2Ï€)/(4Ï€) = 1/2
C = -4Ï€/3
D = -2
Putting these values into the above form gives: Â
 y = 4sin((t+4π/3)/2) -2