Simple Harmonic Motion: the Position X of an Object Varies

Multiple Choice

Simple harmonic motion: The position x of an object varies with time t. For which of the following equations relating x and t is the motion of the object simple harmonic motion? (There may be more than one correct choice.)

A) x = 5 sin²3t
B) x = 8 cos 3t
C) x = 4 tan 2t
D) x = 5 sin 3t
E) x = 2 cos(3t - 1)