# Half Angle Calculator

Half Angle Identity Formulas are those that express the trigonometric functions of half an angle in terms of trigonometric functions of the angle. Half Angle formulas are useful in finding the values of unknown trigonometric functions.

Half Angle Formula

Equations used in Half Angle Formula calculator are below:

**sin( θ / 2 ) = √ 1 - cosθ / 2**

sin( θ / 2 ) = √ 1 + cosθ / 2

tan( θ / 2 ) = 1 - cosθ / sinθ

## half angle identity calculator

Special cases of the sum and difference formulas for sine and cosine yields are known as half angle identities. The advanced online Half Angle Identity Calculator is used to calculate the exact value of half angle identities for the trigonometric values.