Answer:
0.5
2
4π
Explanation:
One cycle resets the process. For this to happen, it must go up, then down to where it started, down more, and then up to where it started. This only goes halfway there, so our first answer is 0.5
The amplitude is the difference in height between the base and the top/bottom, and this is 2.
The period is how long it takes to complete one cycle -- it's halfway at 2π, so it would be fully there at 4π