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where angular frequency o and phase angle f are common to all values of x. In this assumed solution, f and C1, C2,..., Cn are the constants to be determined from the initial boundary conditions of the motion and o is a characteristic value (eigenvalue) of the system. Substituting Equation 2.387 into Equation 2.386 yields

kii

— m11o2

ki2

2

. kin —

mino2

0 0

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