I think there is a typo here. You did not type the question correctly. I will use what you gave us to work with.
y = A sin(Bx + c) + D
Period = 2pi/B
I assume that by 0 you meant to say 0x.
Period = 2pi/0, which is undefined.
I gotta stop here because you did not give us the correct equation to work with.
