| 1−2cos2α | ||
Sprawdź tożsamość | =tgα−ctgα | |
| sinαcosα |
| 1−2cos2α | 1 | |||
Nie wiem co źle robie ale dochodze do momentu | = | i dalej nie | ||
| sinαcosα | sinαcosα |
| sinx | cosx | sinx2 | cos2x | |||||
tgx − ctgx = | − | = | − | = | ||||
| cosx | sinx | cosxsinx | sinxcosx |
| sin2x−cos2x | 1−cos2x−cos2x | 1−2cos2x | |||
= | = |  | |||
| sinxcosx | sinxcosx | sinxcosx |