1) 2 arccos(-1) - arcsin(-1)

Решение: arccos(-1) = π arcsin(-1) = -π/2 Тогда: 2 arccos(-1) - arcsin(-1) = 2π - (-π/2) = 2π + π/2 = 4π/2 + π/2 = 5π/2 Ответ: **5π/2**