Question

1)arccos(-1) - arccos1/2 - 3 arccos (корень из минус 3/2)

2)arccos(sin2п/3)

3)ctg(arccos(-1/2))

Answer 1

1) p-2p-p/3-3(p-p/6)=-p-p/3-3*5p/6=(-8p-15p)/6=-23p/6