π |
2 |
π |
4 |
2π |
T |
又由f(
π |
2 |
∵|?|<π∴?=?
π |
2 |
(Ⅱ)由(Ⅰ)知:f(x)=sin(2x?
π |
2 |
因?yàn)?span>g(x)=(?cos2x)[?cos(2x?
π |
2 |
1 |
2 |
所以,2kπ?
π |
2 |
π |
2 |
kπ |
2 |
π |
8 |
kπ |
2 |
π |
8 |
故函數(shù)g(x)的單調(diào)增區(qū)間為[
kπ |
2 |
π |
8 |
kπ |
2 |
π |
8 |
π |
4 |
π |
2 |
π |
4 |
2π |
T |
π |
2 |
π |
2 |
π |
2 |
π |
2 |
1 |
2 |
π |
2 |
π |
2 |
kπ |
2 |
π |
8 |
kπ |
2 |
π |
8 |
kπ |
2 |
π |
8 |
kπ |
2 |
π |
8 |