Сократите дробь: 1) 2)
1)sin80°/sin40²=sin2.40°/sin40°=2.sin40°cos40°/sin40°=2.cos40° 2)sin110°/cos35°=sin2.55°/cos35°=2.sin55°cos55°/sin(90°-35°)= =2.sin55°cos55°/sin55°=2.cos55°