Problem #6: A particular solution of the differential equation y" - 16y +63y = e7x cos x has the following form (where A, B are constants to be determined): (A) (Ax + b)ex (cos x + sinx) (B) ex (4x cos x + Bx sinx) (C) ex (4 cos x + B sinx) (D) none of these (E) 4e7xx *x cosx (F) Aex cos.x

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