(adsbygoogle = window.adsbygoogle || []).push({}); undamped spring system, need urgent help

hey guys, got my maths exam tomorrow and this question seems to be confusing me, i think they made a mistake, but im not sure, if anyone could show me how to do this question or what answer they found it would be greatly appreciated

question:A mass-spring system consists of a unit mass (that is m = 1kg) and a spring with

stiffness constant k = 9. A forced oscillation of this system without damping is

given by x'' + 16x = sin(2t)

where x(t) is the position of the mass at the time t. If the initial position of the

mass is x(0) = 0 and the initial velocity of it is x'(0) = 2, find the position x(t) of

this initial value problem

Their solution:

x(t) = (11/24)sin(4t)+(1/12)cos(2t)

my answer was colossal compared to theirs

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# Undamped spring system, need help

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