Ответ:
cos²75° - sin²75° = cos(2·75°) = cos150° = cos(180°-30°) = - cos30° = - √3/2.
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
Ответ:
Verified answer
Ответ:
cos²75° - sin²75° = cos(2·75°) = cos150° = cos(180°-30°) = - cos30° = - √3/2.