∴原式=
| −2sinα+cosα |
| cosα+3sinα |
| −2tanα+1 |
| 1+3tanα |
| 3 |
| 7 |
②∵tanα=2，
∴原式=
| sin3α−cos(sin2α+cos2α) |
| sin3α+2cosα(sin2α+cos2α) |
| tan3α−tan2α−1 |
| tan3α+2tan2α+2 |
| 1 |
| 6 |
2cos(
| ||
sin(
|
| sin3α−cosα |
| sin3α+2cosα |
| −2sinα+cosα |
| cosα+3sinα |
| −2tanα+1 |
| 1+3tanα |
| 3 |
| 7 |
| sin3α−cos(sin2α+cos2α) |
| sin3α+2cosα(sin2α+cos2α) |
| tan3α−tan2α−1 |
| tan3α+2tan2α+2 |
| 1 |
| 6 |