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1. The length of a rod is l, and two ends are xed. A longitudinal force is applied on the rod. The force density (force

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1. The length of a rod is l, and two ends are xed. A longitudinal force is applied on the rod. The force density (force per unit length} is Jfusin(-21:35)cosmt. The initial longitudinal displacement is [sin (x/l)]2, and initial velocity is zero. Please find the solution of the longitudinal vibration. {The Young's modulus is E, the intersection area of the rod is S.)

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