2 ! 4 ! 6!3 5 7X X X X NSIN ... ( )X       O X .

4) - TOÁN A3 C3 HUFI EXAM CHUONG 1 A3DH
Toán TOÁN A3 C3 HUFI EXAM CHUONG 1 A3DH

4)

2 ! 4 ! 6!

3 5 7

x x x x n

sin ... ( )

x       O x .