... t (f t) EF 1+ ~(M)2M~ =P(ti)' ui(x)=u(x,tJ, Gi =G(ui-i(O),ui-2(O),Pi-j,Pi-2)' (2 + AM)ui-l - ui-2 1Fi(X) = 2 +2fi(X), Pi =-E(~Ui(O)+Gi)(af t) a5.3. Khao s:lt bai tmin (5 .2.6) -(5 .2.8): ... 1- [(2 + sin x)(u (x) + U (x» + -cos(xu(x»] + -sin u(x) =l(x),~ 4 40 < x < 1 (4 .41), u(O)= 0 (4 .42),. / /3 cosu(1)+sinu(1) (2 + Sill l)(u (1 )+ u (1 » + =b2 (4 .43), trong d64- vdi j = m :"~li.~:~p'~~H-T ... ueX(x,t)=ex-tcas(7tx), pex(t)=-e-t,2m-Iu(m) ( x)= " c~m)w. ( x)p(m) =_~u(m) ( O)-G(m)1 L !J 1'1 """I I'j=OG~m) = G ( (m) ( 0)(m) ( 0)p(m) p(m»I UI-I' UI-2 '...