CÂU 5. (2,5 ĐIỂM). / 4 1X XSIN ; 2 22     I DX J X X X DX

2 .

2

2

abc

 



a

b

ac

c

ab

bc

1

2 1



 



bc a

2

ca

ca b

ab c

1 1 1 1 1 1

     

2

2

2

a bc b ca c ab a bc b ca b ca

  

2 2 2

b c c a a b