1 | 3 | |||
tgα= | =− | zarówno w drugiej i czwartej ćwiartce n | ||
ctgα | 2 |
1 | ||
sinα= | ||
√1+ctg2α |
1 | ||
sinα= | ||
√1+49 |
3√13 | ||
sinα= | ||
13 |
ctgα | ||
cosα= | ||
√1+ctg2α |
(−2/3) | ||
cosα= | ||
√1+49 |
2√13 | ||
cosα=− | w drugiej ćwiartce | |
13 |
2√13 | ||
cosα= | w czwartej ćwiartce | |
13 |
cosx | 2 | |||
ctgx= | =− | |||
sinx | 3 |
2 | ||
cosx=− | sinx | |
3 |
2 | ||
sin2x+( | sinx)2=1 | |
3 |
4 | ||
sin2x+ | sin2x=1 | |
9 |
13 | |
sin2x=1 | |
9 |
9 | ||
sin2x= | ||
13 |
3 | −2 | 3 | ||||
sinx= | , cosx= | * | II ćwiartka | |||
√13 | 3 | √13 |
2 | ||
cosx=− | ||
√13 |