... -0 ,25 Gi A lgiaocatimcnngvi ( ) D ,suyra6 (2 2) 2 Aa + -Blgiaocatimcnngangvi ( ) D ,suyra (2 22) B a -0 ,25 bKhiú 2 236 (2 4)( 2) AB aa = - + -,theobiratacúphngtrỡnh 2 2364( 2) 40( ... ợ.t 2 1 1x t + = ịphngtrỡnh(1)cúdng ( ) 2 2 4 1 2 1 0t y t y - - + - =0 ,25 ( ) ( ) ( ) 2 24 1 8 2 1 4 3y y y D = - - - = - 2 11( ) 2 t yt l = - ộ ờ ị = ờ ở0 ,25 +)Vi 2 2 2 1 2 1 ... 1,0imTacú:0 0 2 2 2 4 41 2sin 2 2cos sin 4sin cos 3cosdx dxIx x x x x x p p - - = = - + - + ũ ũ0 2 241costan 4 tan 3dxxx x p - = - + ũ0 ,25 t 2 1tancost x dt dxx = ị...