2. Consider the system of a harmonic oscillator with retarding force -21UX , restoring force -kx, and driven force 8 e-lwt, The equation of motion if written as A. 8(mä + 21UX - kx) = cos St + i sindt В. 218 (mä + 21UX + kx) = cos ot-i sinot с. (mx- Ux-kx) = cos dt + i sindt 218 D. (mä + 21UX + kx) = cos wt -i sinwt Е. (mä + 21UX + kx) = cos ot +i sinwt F. (mä + Ux + kx) = cos wt - i sinwt (mä – 21UX - kx) = cos 8t-i sindt G. O A O B C
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