Question: ( 2 0 ) 0 , x t u = u ( x , t ) u t t = 4 u . u (

(20)0,xtu=u(x,t)
utt=4u
.u(0,t)=u(,t)=0u(x,0)=x(-x)ut(x,0)=0u.
( 2 0 ) 0 , x t u = u ( x , t ) u t t = 4 u . u (

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