| 5π | ||
x = | + kπ ; k ∊ C | |
| 12 |
| sin2x | 2sinxcosx | tgx | ||||
tg2x = | = | = 2 | ||||
| cos2x | cos2x−sin2x | 1−tg2x |
| 2+√3 | 2+√3 | |||
tg2x = 2 | = 2 | = | ||
| 1−(2+√3)2 | −6−4√3 |
| 2+√3 | 3−2√3 | |||
= − | = | |||
| 3+2√3 | 3−2√3 |
| −√3 | √3 | |||
= − | = − | |||
| 9−12 | 3 |
| √3 | ||
tg2x = − | ||
| 3 |