| tgα (1+ ctg2α) | ||
a) | =ctgα | |
| 1 + tg2 |
| ctgα (1 + tg2α) | ||
b) | =tgα | |
| 1 + ctg2α |
)
| 1 | 1 | |||||||||||
(1+tg2 x) * | = tgx | |||||||||||
| tgx |
|
| 1 | tg2x | ||
+ tgx * | = tgx | ||
| tgx | tg2 x + 1 |
| 1 | tg2 x +1 | ||
+ tgx = tgx * | |||
| tgx | tg2 x |
| 1 | 1 | ||
+tgx = | +tgx | ||
| tgx | tgx |
| 1 | ||
tak samo w a .. zamien sobie ctg2 α = | i wyjdzie  | |
| tg2 α |
Dziękuję i pozdrawiam