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Enter the value of the angle in the box below and choose the unit and trig value to calculate half-angle through the half-angle formula calculator.

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Table of Contents:

The half-angle identity calculator is an online tool devised to find the value of half-angle using the value of the full angle. Users can choose between different units of angles.

Half-angle is a term widely used in trigonometric calculations and it refers to the half of an angle. They are represented as:

- Sin (θ/2)
- Cos (θ/2)
- Tan (θ/2)

A double angle calculator can be used to find the double angle of trignometric identities.

The formulas used for half-angle in trigonometry are:

- Sin (θ/2) = ± √(1-cosθ)/2
- Cos (θ/2) = ± √(1+cosθ)/2
- Tan (θ/2) = ± Sin(θ) / 1 +Cos(θ)

To find half-angle, you need to follow simple simple steps. Let’s understand this through an example.

**Example **

Find the half angle of sin 30 degrees.

**Solution:**

**Step 1: **Substitute the angle in the formula.

Sin (θ/2) = ± √(1-cosθ)/2

**Step 2:** calculate.

Sin (θ/2) = ± √(1-cos(30))/2

= ± 0.2588

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