Verify identity (sin x – cos x) (sin x + cos x) = 1-2^2 x
https://academicpapers.net/wp-content/uploads/2020/08/LOGO-300x75.png00Lizhttps://academicpapers.net/wp-content/uploads/2020/08/LOGO-300x75.pngLiz2021-07-23 21:38:552021-07-23 21:38:55Verify identity (sin x – cos x) (sin x + cos x) = 1-2^2 x