# Double Angle Identity Calculator

Double Angle Formulas refer 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 Identity Calculator
 Enter θ angle in degree: Result:
Formula
sin(2θ) = 2 x sinθ x cosθ
cos(2θ) = 1 - 2sin2θ
tan(2θ) = 2 x tanθ / 1 - tan2θ
A set of formulas that express trigonometric functions of twice an angle in terms of the trigonometric functions of the original angle is called as doublw angle identity formula. The advanced online Double Angle Identity Calculator i9s used to calculate the expression of trigonometric functions of angles that are equal to 2θ in terms of θ.

Example:
Calculate the double angle trigonometric identity for the given sinθ angle in degree.
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