| ||
| 2 |
| π |
| 3 |
| π |
| 3 |
| cos2x+1 |
| 2 |
=
| 3 |
| 1 |
| 2 |
=2sin(2x-
| π |
| 6 |
| 1 |
| 2 |
∴f(x)的最小正周期T=π.
当2kπ-
| π |
| 2 |
| π |
| 6 |
| π |
| 2 |
即有kπ-
| π |
| 6 |
| π |
| 3 |
故所求区间为[kπ-
| π |
| 6 |
| π |
| 3 |
(Ⅱ)函数f(x)的图象向右平移m(m>0)个单位后得:
g(x)=2sin[2(x-m)-
| π |
| 6 |
| 1 |
| 2 |
要使g(x)的图象关于原点对称,只需要-2m-
| π |
| 6 |
即有m=
| k |
| 2 |
| π |
| 12 |
| 5π |
| 12 |
| 3 |
| π |
| 3 |
| ||
| 2 |
| π |
| 3 |
| π |
| 3 |
| cos2x+1 |
| 2 |
| 3 |
| 1 |
| 2 |
| π |
| 6 |
| 1 |
| 2 |
| π |
| 2 |
| π |
| 6 |
| π |
| 2 |
| π |
| 6 |
| π |
| 3 |
| π |
| 6 |
| π |
| 3 |
| π |
| 6 |
| 1 |
| 2 |
| π |
| 6 |
| k |
| 2 |
| π |
| 12 |
| 5π |
| 12 |