5.21. Using the definition of the arcsecant function from Problem 51, for what values of x is it true that (a) sec (arcsec x) = x and (b) arcsec (sec x) = x? For reference: 51. One definition of the arcsecant function is y = arcsecx(or y = sec"x) if and only if x = sec y, where 0 s ySn and y 7/2. (See Problem 52 for an alternative definition.) Graph y = arcsec x, and give the domain and the range of this function. %3D

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