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Amplitude is the height from the mean, or rest, value of the function to its maximum or minimum. The period is the distance required for the function to complete one full cycle. For the sine function, the amplitude is given by and the period is defined as. The same is true for a cosine function.
Begin by realizing we are dealing with a periodic function, so sine and cosine are your best bet. Next, note that the range of the function is and that the function goes through the point . From this information, we can find the amplitude: