π |
6 |
| ||
2 |
1 |
2 |
=
| ||
2 |
1 |
2 |
=sin(2x+
π |
6 |
所以函数f(x)的单调递增区间是〔kπ−
π |
3 |
π |
6 |
(Ⅱ)因为f(A)=
1 |
2 |
π |
6 |
1 |
2 |
又0<A<π所以
π |
6 |
π |
6 |
13π |
6 |
从而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
从而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 |