The displacement of a particle varies according to the relation $x = 3 \ sin\ 100t + 8\ cos^2\ 50t$ . Which of the following is incorrect about this motion
AThe motion of the particle is $S.H.M.$
BThe amplitude of the $S.H.M.$ of the particle is $5\ units$
CThe amplitude of the resultant $S.H. M.$ is $\sqrt {73} \ units$
DThe maximum displacement of the particle from the origin is $9\ units$
Medium
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CThe amplitude of the resultant $S.H. M.$ is $\sqrt {73} \ units$
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