teraz wylicz c (Pitagoras); sinus i cosinus z definicji i podstaw do podanego wyrażenia
| 3sin(x) − 4cos(x) | cos(x)[3tg(x) − 4] | ||
= | = | ||
| 2sin(x) | cos(x) * 2tg(x) |
| 3tg(x) − 4 | |
| 2tg(x) |
| 1 | 5 | |||
ctgx= | = | |||
| tgx | 4 |
| 3sinx | cosx | 3 | 3 | 5 | ||||||
W= | −4 | = | −2ctgx= | −2* | .......... | |||||
| 2sinx | 2sinx | 2 | 2 | 4 |