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Oscillations

# The motion of an object is given by $x=23 \sin^2(2-3t).$ This is a

a) Random motion b) Simple harmonic motion c) Combination of a number of simple harmonic motions d) None of the above

$\sin ^2(2t)$ can be expressed in terms of $\cos (4t)$ which makes motion SHM
So it is simple harmonic motion.
Hence b is the correct answer.