| cos107∘cos73∘ | ||
wartość wyrażenia | wynosi | |
| sin73∘sin 107∘ |
| 1 | 1 | |||
A) 1 B) − 1 C) 1− | D) | |||
| sin273∘ | tg273∘ |
| cos107∘cos73∘ | 1 | 1 | |||
= | * | = | |||
| sin73∘sin 107∘ | tg730 | tg1070 |
| 1 | 1 | |||
− | * | = | ||
| tg730 | tg730 |
| 1 | ||
− | ||
| tg2730 |
| −cos73 cos73 | ||
= | ||
| sin73 sin73 |
| cos107*cos73 | |
= | |
| sin73*sin107 |
| −1 | ||
=ctg(107)*ctg (73)=−ctg2(73)= | ||
| tg2(73) |
| 1 | sin2(73)−1 | −cos2(73) | ||||
1− | = | = | =−ctg2(73} i pasuje | |||
| sin2 (73) | sin2(73) | sin2(73) |
