2 |
π |
4 |
∵ω=2,∴T=π,
∴f(x)的最小正周期π;
當(dāng)2kπ-
π |
2 |
π |
4 |
π |
2 |
解得:kπ-
3π |
8 |
π |
8 |
則x∈[kπ-
3π |
8 |
π |
8 |
(2)當(dāng)x∈[0,
π |
6 |
π |
4 |
π |
4 |
7π |
12 |
當(dāng)2x+
π |
4 |
π |
2 |
π |
8 |
π |
4 |
則f(x)max=
2 |
解得:a=1-
2 |
令2x+
π |
4 |
π |
2 |
kπ |
2 |
π |
8 |
π |
6 |
2 |
π |
4 |
π |
2 |
π |
4 |
π |
2 |
3π |
8 |
π |
8 |
3π |
8 |
π |
8 |
π |
6 |
π |
4 |
π |
4 |
7π |
12 |
π |
4 |
π |
2 |
π |
8 |
π |
4 |
2 |
2 |
π |
4 |
π |
2 |
kπ |
2 |
π |
8 |