What is the maximum of the sinusoidal function?

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