| 2 | |
−1=1+2tg2α | |
| cos2α |
| 2 | cos2α | ||
− | |||
| cos2α | cos2α |
| 2−cos2α | |
| cos2α |
| 2−(1−sin2α) | |
| cos2α |
| 1−sin2α | |
| cos2α |
| sinα | ||
tgα= | ||
| cosα |
| sin2α | 2−2cos2α | |||
1+2tg2α=1+2* | =1+ | = | ||
| cos2α | cos2α |
| cos2α | 2−cos2α | 2 | ||||
= | + | = | −1 | |||
| cos2α | cos2 | cos2α |
| 2−1+ sin2α | 1+sin2α | |||
= | = | = | ||
| cos2α | cos2α |
| sin2α+cosα+sin2α | cos2α | 2sin2α | |||
= | + | = | |||
| cos2α | cos2α | cos2α |