| 1+tanx |
| 1−tanx |
则
| 1 |
| cos2x |
| 1 |
| cos2x |
| sin2x |
| cos2x |
| 1+sin2x |
| cos2x |
| (sinx+cosx)2 |
| cos2x−sin2x |
=
| cosx+sinx |
| cosx−sinx |
| 1+tanx |
| 1−tanx |
故答案为:2010
| 1+tanx |
| 1−tanx |
| 1 |
| cos2x |
| 1+tanx |
| 1−tanx |
| 1 |
| cos2x |
| 1 |
| cos2x |
| sin2x |
| cos2x |
| 1+sin2x |
| cos2x |
| (sinx+cosx)2 |
| cos2x−sin2x |
| cosx+sinx |
| cosx−sinx |
| 1+tanx |
| 1−tanx |