! Licze i licze i ciagle wychodzi mi −1, a powinno wyjsc 2−√3 (wg odp) w zadaniu
tg 15°
| α | 1 − cosα | |||
tg | = | |||
| 2 | sinα |
| 1 − cos30o |
| 2 | |||||||||||||
tg15o = | = | * | = ... | ||||||||||||
| sin30o |
| 2 |
| tgα−tgβ | ||
tg(α−β)= | ||
| 1+tgα*tgβ |
| 1−√33 | 3−√3 | 3 | ||||
tg15o= tg( 45o−30o) = | = | * | =
| |||
| 1+√33 | 3 | 3+√3 |
| (3−√3)(3−√3) | 12−6√3 | |||
= | = | = 2−√3 | ||
| (3+√3)(3−√3) | 6 |