(a) To define the inverse sine function, we restrict the domain of sine to the interval ___________. On this interval the sine function is one-to-one, and its inverse function is defined by . For example, because .
(b) To define the inverse cosine function, we restrict the domain of cosine to the interval . On this interval the cosine function is one-to-one and its inverse function is defined . For example, because .
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