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Something i am doing is not adding up. I don't understand the part with the external force. here's the question:
Show that the solution for the damped free forced vibration given by
is
when
, where 
something along the way i'm doing wrong, because not for heck can i get that fraction with the sin theta part.
Help Please?
Show that the solution for the damped free forced vibration given by




something along the way i'm doing wrong, because not for heck can i get that fraction with the sin theta part.
Help Please?