| cosA |
| cosB |
| sinB |
| sinA |
∴2A=2B或2A+2B=π,即A=B或A+B=
| π |
| 2 |
当A=B时,有sin(π-2A)=cosA,即sinA=
| 1 |
| 2 |
| π |
| 6 |
| 2π |
| 3 |
当A+B=
| π |
| 2 |
| π |
| 2 |
∴A=B=
| π |
| 6 |
| 2π |
| 3 |
(Ⅱ)由(Ⅰ)及题设知:f(x)=sin(2x+
| π |
| 6 |
| π |
| 3 |
| π |
| 6 |
当2x+
| π |
| 6 |
| π |
| 2 |
| π |
| 2 |
| π |
| 6 |
即f(x)=2sin(2x+
| π |
| 6 |
| π |
| 3 |
| π |
| 6 |
它的相邻两对称轴间的距离为
| π |
| 2 |
| cosA |
| cosB |
| b |
| a |
| C |
| 2 |
| cosA |
| cosB |
| sinB |
| sinA |
| π |
| 2 |
| 1 |
| 2 |
| π |
| 6 |
| 2π |
| 3 |
| π |
| 2 |
| π |
| 2 |
| π |
| 6 |
| 2π |
| 3 |
| π |
| 6 |
| π |
| 3 |
| π |
| 6 |
| π |
| 6 |
| π |
| 2 |
| π |
| 2 |
| π |
| 6 |
| π |
| 6 |
| π |
| 3 |
| π |
| 6 |
| π |
| 2 |