If tan^-1 x=y then : (a) -1lt y lt 1 (...

If `tan^-1 x=y` then :
(a) `-1lt y lt 1`
(b)` frac(-pi)(2)le y le frac(pi)(2)`
(c)`frac(-pi)(2)lt y lt frac(pi)(2)`
(d)`y in {frac(-pi)(2),frac(pi)(2)}`

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