3SIN2 COS2 2COS 1 2 3SIN COS 2COS2 1 2COS 1X X X X X X X ...
Câu 2.
TXĐ:
3sin2
cos2
2cos
1
2 3sin cos
2cos
2
1 2cos
1
x
x
x
x
x
x
x
cos
3 sin
cos
1 0
x
x
x
cos
0
x
x
k
3
sin
1
cos
1
sin
2
1
2
2
2
6
2
x
k
2
2
x
m
x m
k n m
2
2
, ,
6 6
5
2
2
3
2
x
n
6
6