What is the formula of cos2(A+B) and cos2(A-B) ? Share with your friends Share 1 Varun Rawat answered this cos2A+B=cos2A+B - sin2A+B As, cos 2x = cos2x - sin2x cos2A+B=2 cos2A+B - 1 As, sin2x + cos2x = 1 cos2A+B=1 - 2 sin2A + B As, sin2x + cos2x = 1cos2A + 2B = cos 2A . cos 2B - sin 2A . sin 2B as, cosx+y = cos x . cos y - sin x sin y cos2A-B=cos2A-B - sin2A-B As, cos 2x = cos2x - sin2x cos2A-B=2 cos2A-B - 1 As, sin2x + cos2x = 1 cos2A-B=1 - 2 sin2A - B As, sin2x + cos2x = 1cos2A - 2B = cos 2A . cos 2B + sin 2A . sin 2B as, cosx-y = cos x . cos y + sin x sin y 0 View Full Answer