а) sin110°-sin50° = 2cos80°80°80°sin30°30°30° = 2cos80°80°80°1/21/21/2 = cos80°
б) cos110°+cos50° = 2cos80°80°80°cos30°30°30° = 2cos80°80°80°√3/2√3/2√3/2 = √3cos80°
в) cos110°- cos50° = -2sin80°80°80°sin30°30°30° = -2sin80°80°80°1/21/21/2 = -sin80°
а) sin110°-sin50° = 2cos80°80°80°sin30°30°30° = 2cos80°80°80°1/21/21/2 = cos80°
б) cos110°+cos50° = 2cos80°80°80°cos30°30°30° = 2cos80°80°80°√3/2√3/2√3/2 = √3cos80°
в) cos110°- cos50° = -2sin80°80°80°sin30°30°30° = -2sin80°80°80°1/21/21/2 = -sin80°