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In mathematics, cos 2x refers to the cosine of twice the angle x. To fully understand cos 2x, let's break it down. Cos2x is a double-angle formula in Trigonometry that is used to find the value of the Cosine Function for double angles, where the angle is twice that of x. Cos2X Formula is one of the essential trigonometric identities used to determine the value of the cosine trigonometric function for double angles. In terms of Cosx, the Cos2x Formula is cos2x = 2cos²x – 1. The trigonometric identities cos2x = cos 2 x – sin 2 x and cos 2 x + sin 2 x = 1 can be used to calculate it.
