(sin x + cos x)² + (sin x - cos x)² = 2
sin²x + 2sin x cos x + cos²x + sin² x - 2sin x cos x + cos² x = 2
(sin² x + cos² x) + (sin² x + cos² x²) = 1 + 1 = 2
Copyright © 2024 ELIBRARY.TIPS - All rights reserved.