| 1 | ||
3 + tg2x = 2 + | ||
| cos2 x |
| 1 | ||
tg2x + 1 = | ||
| cos2x |
| 1 | cos2x | 1 − cos2x | sin2x | |||||
tg2x = | − | = | = | = | ||||
| cos2x | cos2x | cos2x | cos2x |
| sin x | ||
= ( | )2 = tg2 x | |
| cos x |
| 1 | ||
3 + tg2x = 2 + | ||
| cos2 x |
| 1 | ||
tg2x + 1 = | ||
| cos2x |
| 1 | cos2x | 1 − cos2x | sin2x | |||||
tg2x = | − | = | = | = | ||||
| cos2x | cos2x | cos2x | cos2x |
| sin x | ||
= ( | )2 = tg2 x | |
| cos x |