Enter a value x into the calculator. The calculate will evaluate and display the inverse cosine of the angle using the arcosine formula.

## Inverse Cosine Formula

The following formula can be used to calculate an angle from any cosine value.

Arccosine(x) = C

Cosine C = x

- Where AC is arc cosine, which is the same as saving inverse cosine
- x is a cosine value of two sides of a triangle.

## FAQ

**What is the inverse cosine?**

The inverse cosine is also known as the arc cosine, and is used to calculate the value of an angle when the cosine of that angle is known.

**What is arc cosine?**

Arc cosine is just another way of saying the inverse cosine. The formula is the same as the inverse cosine.

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