3 |
| ||
2 |
1 |
2 |
1 |
2 |
π |
6 |
1 |
2 |
∵ω>0,∴T=
2π |
2ω |
∴ω=1.
(2)由(1)可知f(x)=-sin(2x-
π |
6 |
1 |
2 |
∵2kπ-
π |
2 |
π |
6 |
π |
2 |
得kπ-
π |
3 |
2π |
3 |
由2kπ+
π |
2 |
π |
6 |
3π |
2 |
得kπ+
2π |
3 |
5π |
3 |
所以函數(shù)的單調(diào)減區(qū)間為[kπ-
π |
3 |
2π |
3 |
函數(shù)的單調(diào)增區(qū)間為[kπ+
2π |
3 |
5π |
3 |
a |
3 |
b |
a |
b |
3 |
| ||
2 |
1 |
2 |
1 |
2 |
π |
6 |
1 |
2 |
2π |
2ω |
π |
6 |
1 |
2 |
π |
2 |
π |
6 |
π |
2 |
π |
3 |
2π |
3 |
π |
2 |
π |
6 |
3π |
2 |
2π |
3 |
5π |
3 |
π |
3 |
2π |
3 |
2π |
3 |
5π |
3 |