|
解:(1)该函数的周期T= |
13π |
|
3 |
|
- |
π |
|
3 |
|
=4π, |
∴ω= |
2π |
|
T |
|
=,又A=3, 所给图象是曲线y=3sin |
沿x轴向右平移 |
π |
|
3 |
|
而得到的, 故所求函数解析式是 |
y=3sin(x- |
π |
|
3 |
|
) |
=3sin(x- |
π |
|
6 |
|
) |
(2)设(x,y)为y=3sin(x- |
π |
|
6 |
|
)上的任意一点, 该点关于直线x=2π |
的对称点应为(4π-x,y)故与y=3sin(x- |
π |
|
6 |
|
) |
关于直线x=2π对称的函数解析式是
y=3sin( |
4π-x |
|
2 |
|
- |
π |
|
6 |
|
)=-3sin(+ |
π |
|
6 |
|
) |
|