# Double angle calculator

Table of Contents:

## Double angle formula

**sin(2θ) = 2 x sinθ x cosθ cos(2θ) = 1 - 2sin ^{2}θ tan(2θ) = 2 x tanθ / 1 - tan^{2}θ**

Double angle calculator used to calculate Double angle formula which refers to the expression of trigonometric functions of angles equal to 2θ in terms of θ. The double angle identity formula is an equation that expresses a trigonometric function of twice an angle in terms of trigonometric functions of the angle. Double-angle formulas are especially useful in finding the values of unknown trigonometric functions.

## Double angle identities calculator

A set of formulas that express trigonometric functions of twice an angle in terms of the trigonometric functions of the original angle is called a doublw angle identity formula. The advanced online Double Angle Formula (identity) Calculator i9s used to calculate the expression of trigonometric functions of angles that are equal to 2θ in terms of θ.

__ Example__:

To calculate the double angle trigonometric identity for the given sinθ angle in degree using double angle identities calculator.

Enter θ angle in degree: 30 sin (2u)

__ Solution__:

**Apply formula:**

Sin (2θ) = 2 x sinθ x cosθ

Sin (2*30) = 2*30*0.15425145

**Sin 60 = 0.866025**