# math – Inverse Cosine in Python

## math – Inverse Cosine in Python

We have the `acos`

function, which returns the angle in radians.

```
>>> import math
>>> math.acos(0)
1.5707963267948966
>>> _ * 2 - math.pi
0.0
```

To augment the correct answers to use `math.acos`

, it is also worth knowing that there are math functions suitable for complex numbers in `cmath`

:

```
>>> import cmath
>>> cmath.acos(1j)
(1.5707963267948966-0.88137358701954294j)
```

Stick with `math.acos`

if youre only interested in real numbers,

#### math – Inverse Cosine in Python

The result of `math.acos()`

is in radians. So you need to convert that to degrees.

Here is how you can do:

```
import math
res = math.degrees (math.acos (value))
```