Double Angle Identities Calculator

Enter θ angle in degree:
Result

The online Double Angle Identity Calculator is used to calculate trigonometric functions of angles that are equal to 2θ in terms of θ.

Double Angle Identities formula

sin(2θ) = 2 x sinθ x cosθ

tan(2θ) = 2 x tanθ / 1 - tan2θ

cos(2θ) = 1 - 2sin2θ

For example, θ = 15º, sin(2θ) = 0.5, cos(2θ) = 0.866025, tan(2θ) = 0.57735.