What is the maximum of the sinusoidal function?
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A sinusoidal function that begins at negative nine comma negative two and increases to negative seven comma zero and decreases until reaching a low point of negative five comma negative two. The graph then increases until it reaches a high point of negative three comma zero. The graph then decreases until it reaches a low point of negative one comma negative two. The graph then increases through zero comma negative one until it reaches a high point of one comma zero. The graph then decreases until it reaches a low point of three comma negative two. The graph then increases until it reaches a high point of five comma zero. The graph then decreases until it reaches a low point of seven comma negative two. The graph then increases until it reaches a high point of nine comma zero. The graph then decreases until it reaches a low point of eleven comma negative two.