(ctg 45°-2sin pi/6)* cos 3pi/4
(ctg (45°) - 2sin (π/6)) × cos (3π/4) (ctg (π/4) - 2 * 1/2) × cos (3π/4) (1 - 1) × cos (3π/4) 0 × cos (3π/4) Ответ: 0