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Section 1.3 3. a. Solve the following initial boundary value problem for the heat equation 0x<L t0 at u(r, 0) f() u(0, t)u(L,

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3 a) u O 2 UV10) -ナle)= 6Sin (22) ulo, t) L) =0. l,E)Flu GlE) Let F() GI+) aヒ FG FG D G SirCB -crtt F(0) = F(4)=0 . s ince t=) G e-Dn2t DG Bn Sin(nzx) e-ona Bn sin (nzx) enizi ) 2) N= =) =sin/) Bn sin sin/)sin) since n9 81 2D/L2 G sin b) D2 o xL/2 UFlw) Ancosn e-n An Cos ulx,t) Ao + 2- ( rcas/)dJe*)dn An cos Ul,o)fl)= Ao + n-l cln= An 2 니2 니2 An ose= 2 sin - L/2 니2 -- sin

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