If utt 4ura u(x, 0) = e", u4(x, 0) = 0, u, Ux → 0 as x → ∞, then u e* cosh(2t) O e2 cosh(4t) O e2¤ cosh(2t) O eAz cosh(t) O e" cosh(4t) O eA# cosh(4t) O e2# cosh(t) O

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