Prove that: 3. (cos x + cos y)^2 + (sin x – sin y)^2 = 4 cos^2 x + y/2 Prove that: 3. (cos x + cos y)^2 + (sin x – sin y)^2 = 4 cos^2 x + y/2 October 24, 2021 Category: Chapter 3 - Trigonometric Functions , Maths , NCERT Exemplar Class 11 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related
