| ||
| 10 |
2
| ||
| 5 |
∵α、β为锐角,∴sinα=
7
| ||
| 10 |
| ||
| 5 |
∴tanβ=
| 1 |
| 2 |
(1)tan(α+β)=
7+
| ||
1−7×
|
(2)
| sin2α+sin2α |
| 6cos2α+cos2α |
| sin2α+2sinαcosα |
| 7cos2α−sin2α |
| tan2α+2tanα |
| 7−tan2α |
| 49+14 |
| 7−49 |
| 3 |
| 2 |
| ||
| 10 |
2
| ||
| 5 |

| sin2α+sin2α |
| 6cos2α+cos2α |
| ||
| 10 |
2
| ||
| 5 |
7
| ||
| 10 |
| ||
| 5 |
| 1 |
| 2 |
7+
| ||
1−7×
|
| sin2α+sin2α |
| 6cos2α+cos2α |
| sin2α+2sinαcosα |
| 7cos2α−sin2α |
| tan2α+2tanα |
| 7−tan2α |
| 49+14 |
| 7−49 |
| 3 |
| 2 |