Prove the following: 10. sin (n + 1)x sin (n + 2)x + cos (n + 1)x cos (n + 2)x = cos x Prove the following: 10. sin (n + 1)x sin (n + 2)x + cos (n + 1)x cos (n + 2)x = cos x October 22, 2021 Category: Chapter 3 - Trigonometric Functions , Maths , NCERT Exemplar Class 11 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related
