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Exact discrete solution

un=Icos(˜ωnΔt),˜ω=2Δtsin1(ωΔt2)

The error mesh function, en=ue(tn)un=Icos(ωnΔt)Icos(˜ωnΔt) is ideal for verification and further analysis! en=Icos(ωnΔt)Icos(˜ωnΔt)=2Isin(t12(ω˜ω))sin(t12(ω+˜ω))

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