複選題

27 A particle moves as following as a function of time: X = 3.0m xcos(2.0radian / s ×T+π/3), where distance (X) is measured in meters (m) and time (T) in seconds (s). Which answers are correct in the following?
(A)The amplitude of the simple harmonic motion is 3.0 m.
(B)The amplitude of the simple harmonic motion is 6.0 m.
(C)The angular frequency is 2.0 radian/s.
(D)The angular frequency is 0.318 radian/s.
(E)The angular frequency is 6.28 radian/s.