Posted by Hannah on Monday, February 1, 2010 at 9:32pm.
The amplitude is how far y can increase above (or decrease below) the average value. The average value is zero. The maximum value is 3. The amplitude is therefore 3.
The period is how much x must increase in fr y to return to the original value (regardless of x).
2x must increase by 2 pi for that to happen. Therefore the period is pi
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