а) sin (-23π/6) = sin (-4π - π/6) = sin (-π/6) = -sin(π/6) = -1/2
б) ctg(-600) = cot(-600) = cot(600) = cot(2π + 2π/3) = cot(2π/3) = cot(120°) = tan(60°) = √3
а) sin (-23π/6) = sin (-4π - π/6) = sin (-π/6) = -sin(π/6) = -1/2
б) ctg(-600) = cot(-600) = cot(600) = cot(2π + 2π/3) = cot(2π/3) = cot(120°) = tan(60°) = √3