To find the arccosine, or inverse cosine, of a number, we can use the Python **acos()** function from the math module.

```
import math
math.acos(x)
```

In Python, we can easily use trigonometric functions with the Python math module. The Python math module allows us to perform trigonometry easily.

With the Python math module, we can find the arccosine of a number easily.

To find the arccosine of a number, we use the math **acos()** function.

Below is the Python syntax to find the inverse cosine of a number.

```
import math
math.acos(x)
```

The input to the **acos()** function must be a numeric value between -1 and 1. The return value will be a numeric value between 0 and pi radians.

```
import math
print(math.acos(0.5))
print(math.acos(0))
print(math.acos(-0.75))
#Output:
1.0471975511965979
1.5707963267948966
2.4188584057763776
```

## Finding the Inverse Cosine of a Number in Python

Arccosine is defined as the inverse of the cosine of a number.

Below, we show that if we pass a number to **cos()** and then call the Python **acos()** function, we get back the same number.

```
import math
print(math.acos(math.cos(math.pi/3)))
print(math.pi/3)
#Output:
1.0471975511965976
1.0471975511965976
```

Hopefully this article has been beneficial for you to understand how to use the math **acos()** function in Python to find the arccosine of a number.

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