# Double Angle Identity Solver, Formula - Trig Calculator

Double Angle Trig Identity solver is used to solve the expression of trigonometric functions of angles equal to 2θ in terms of θ based on the trig identity formula.

## Double Angle Trig Identity

• Enter θ angle in degree:

•

### Result

• Double Angle Trig Identity:

Formula Used:

sin(2θ) = 2 x sinθ x cosθ
cos(2θ) = 1 - 2sin2θ
tan(2θ) = 2 x tanθ / 1 - tan2θ

Double Angle Trig Identities are especially useful in finding the values of unknown trigonometric functions from the derived formulas.