3 |
=
| ||
2 |
1 |
2 |
1 |
2 |
π |
6 |
由f(x)的周期 T=
2π |
2ω |
π |
2 |
(2)由(Ⅰ)得 f(x)=sin(4x-
π |
6 |
1 |
2 |
a2+c2−b2 |
2ac |
2ac−ac |
2ac |
1 |
2 |
又∵0<x<π,∴0<x≤
π |
3 |
π |
6 |
π |
6 |
7π |
6 |
1 |
2 |
π |
6 |
∴-1≤sin(4x-
π |
6 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
3 |
π |
2 |
3 |
| ||
2 |
1 |
2 |
1 |
2 |
π |
6 |
2π |
2ω |
π |
2 |
π |
6 |
1 |
2 |
a2+c2−b2 |
2ac |
2ac−ac |
2ac |
1 |
2 |
π |
3 |
π |
6 |
π |
6 |
7π |
6 |
1 |
2 |
π |
6 |
π |
6 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |