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(D) VULTUULT 13Tasu, Salum215 LIU(AQ.9Le...

(D) VULTUULT 13Tasu, Salum215 LIU(AQ.9Let f:I vec I, defined as f(x) = 2 sin (21x) - 10 tan (51x) + 7 cos (41x) +3, then which of thefollowing statement(s) is/are TRUE?(A)f(x) is periodic function.(B)f(x) is an even function.(C)f(x) is an odd function and its inverse exists. (D) f(f(f(x))) = f(f(x)) for all x el.[Note: I denote the set of all integers.]

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