3 |
| ||
2 |
1?cos2x |
2 |
π |
6 |
1 |
2 |
∴函數(shù)f(x)的最小正周期為π; …(5分)
由2kπ?
π |
2 |
π |
6 |
π |
2 |
π |
6 |
π |
3 |
∴f(x)的單調(diào)遞增區(qū)間是[kπ?
π |
6 |
π |
3 |
(Ⅱ)∵f(x)=sin(2x?
π |
6 |
1 |
2 |
π |
12 |
1 |
2 |
∴先由函數(shù)y=sin2x的圖象向右平移
π |
12 |
1 |
2 |
3 |
3 |
| ||
2 |
1?cos2x |
2 |
π |
6 |
1 |
2 |
π |
2 |
π |
6 |
π |
2 |
π |
6 |
π |
3 |
π |
6 |
π |
3 |
π |
6 |
1 |
2 |
π |
12 |
1 |
2 |
π |
12 |
1 |
2 |