а) f(7.5π) = cot(7.5π) = 1/tan(7.5π) = 1/(-∞) = 0
б) f(19π/3) = cot(19π/3) = 1/tan(19π/3) = 1/(-√3) = -√3/3
в) f(-25π/4) = cot(-25π/4) = 1/tan(-25π/4) = 1/1 = 1
а) f(7.5π) = cot(7.5π) = 1/tan(7.5π) = 1/(-∞) = 0
б) f(19π/3) = cot(19π/3) = 1/tan(19π/3) = 1/(-√3) = -√3/3
в) f(-25π/4) = cot(-25π/4) = 1/tan(-25π/4) = 1/1 = 1