3 |
1 |
2 |
| ||
2 |
1 |
2 |
π |
6 |
∴最小正周期为
2π |
2 |
令−
π |
2 |
π |
6 |
π |
2 |
π |
3 |
π |
6 |
所以函数的单调递增区间是[−
π |
3 |
π |
6 |
(2)列表
2x+
| 0 |
| π |
| 2π | ||||||||||
x | −
|
|
|
|
| ||||||||||
f(x) | 0 | 1 | 0 | -1 | 0 |
![](http://hiphotos.baidu.com/zhidao/pic/item/b812c8fcc3cec3fd10e44ec4d588d43f869427ad.jpg)
3 |
1 |
2 |
3 |
1 |
2 |
| ||
2 |
1 |
2 |
π |
6 |
2π |
2 |
π |
2 |
π |
6 |
π |
2 |
π |
3 |
π |
6 |
π |
3 |
π |
6 |
2x+
| 0 |
| π |
| 2π | ||||||||||
x | −
|
|
|
|
| ||||||||||
f(x) | 0 | 1 | 0 | -1 | 0 |