Question

Cine știe, va rog, dau coroana, repede, acum ​

Answer 1

Răspuns:

Explicație pas cu pas:

1) sin20 = cos(90 -20) = cos70

cos70 -cos70 = 0

2) ctg25 = tg(90-25) = tg65

tg65 -tg65 = 0

3) cos85 -cos85 = 0

4) 1/2 -1/2 = 0

5) tg82 -tg82 = 0

6) cos50/cos50 = 1

7) tg8/tg8 = 1

8) cos73 -cos73 + cos50 -cos50 = 0

9) ctg86 -ctg86 + tg72 -tg72 = 0

etc.