5. Solve the telegraph equation

 for 0 ＜x ＜L, t ＞ 0. A and B are positive constants.
The boundary conditions are
u(0,t)=u(L,t)=0 for t ≥ 0,
and the initial conditions are

 Assume that A²L² ＜4(BL²+c²π²) (20%)

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