π |
6 |
| ||
2 |
1 |
2 |
=
| ||
2 |
1 |
2 |
=sin(2x+
π |
6 |
所以函數(shù)f(x)的單調(diào)遞增區(qū)間是〔kπ?
π |
3 |
π |
6 |
(Ⅱ)因?yàn)閒(A)=
1 |
2 |
π |
6 |
1 |
2 |
又0<A<π所以
π |
6 |
π |
6 |
13π |
6 |
從而2A+
π |
6 |
5π |
6 |
π |
3 |
在△ABC中,∵a=1,b+c=2,A=
π |
3 |
∴1=b2+c2-2bccosA,即1=4-3bc.
故bc=1
從而S△ABC=
1 |
2 |
| ||
4 |
π |
6 |
1 |
2 |
π |
6 |
| ||
2 |
1 |
2 |
| ||
2 |
1 |
2 |
π |
6 |
π |
3 |
π |
6 |
1 |
2 |
π |
6 |
1 |
2 |
π |
6 |
π |
6 |
13π |
6 |
π |
6 |
5π |
6 |
π |
3 |
π |
3 |
1 |
2 |
| ||
4 |