Posted in Web What is the formula of 1+cos2x? – Quora October 3, 2021 Answer (1 of 14): Cos2x = cos²x – sin²x Hence 1 + Cos2x = 1 + cos²x – sin²x 1 + Cos2x = cos²x + cos²x 1 + Cos2x = 2cos²x https://www.quora.com/What-is-the-formula-of-1-cos2x