Python acos – Find Arccosine and Inverse Cosine of Number

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.