Cos2x is a trigonometric function that is used to find the value of the cos function for angle 2x. Its formula are cos2x = 1 - 2sin^2x, cos2x = cos^2x - sin^2x . Learn how to derive and apply the sin2x formula , a trigonometric identity that relates the sine of an angle with a double value. See different forms of the sin2x formula in terms of sin, cos, and tan, and solved examples using the formula . Sin Squared x Formula Sin squared x means sin x whole squared. There is two sin squared x formulas. One of them is derived from one of the Pythagorean identities and the other is derived from the double angle formula of the cosine function. The former is used in proving various trigonometric identities whereas the latter is widely used in solving the integrals. Let us learn the sin squared x formulas along with derivations and a few solved examples. Sin 2x is expressed in different forms using various trigonometric functions. The most common formula of sin 2x is, sin 2x = 2 sinx cosx . It can also be expressed in terms of the tan function. Sin 2x is a double-angle identity in trigonometry.
