Найти значение выражений
Sin²105-cos²105
cos(2x) = cos²x - sin²x
Sin²105-cos²105 = -cos(2*105) = - cos(210) = -cos(180+30) = cos30 = (3)^0.5/2
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
cos(2x) = cos²x - sin²x
Sin²105-cos²105 = -cos(2*105) = - cos(210) = -cos(180+30) = cos30 = (3)^0.5/2