Question

Вычеслить.
1) cos (arccos 4/5)
2)sin(arcsin π/12
3) tg(arctg 1)
4) arcsin (sin π/9)
5) arccos ( cos 8π/9)
6)arctg (tg 2)

Answer 1

1) cos (arccos 4/5) = 4/5
2) sin(arcsin π/12) = π/12
3)  tg(arctg 1) = 1
3) arcsin (sin π/9) = π/9
4) arccos (cos 8π/9) = 8π/9
5) arctg (tg 2) = 2 - π