| ||
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 |