1) 2arcsin(√3/2) + arcsin(-1/2)

Решение: arcsin(√3/2) = π/3, arcsin(-1/2) = -π/6. Подставляем: 2arcsin(√3/2) + arcsin(-1/2) = 2(π/3) - π/6 = π - π/6 = 5π/6. Ответ: 5π/6.