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Python cmath.acos() Function

The Python cmath.acos() function specifies the arc cosine of an angle, in radius.

The arc cosine of an angle is defined as the inverse of a cosine function. Whereas, the domain of the arc cosine function is in the range [-1,1], and this range is obtained in the form of radians.

Following is the syntax for the Python cmath.acos() function −

cmath.acos(x)

This function contains a numeric value in the range of -1 to 1. If x is greater than 1 or less than -1, then it will generate an error.

This function returns the arccosine of x in radians.

In the below example, we are finding the arc cosine function for the standard values like '0','-1' and '1' using cmath.acos() function.

import cmath
zero = cmath.acos(0)
neg_one = cmath.acos(-1)
pos_one = cmath.acos(1)
print("Arc Cosine value of 0:", cmath.acos(zero))
print("Arc Cosine value of -1:", cmath.acos(neg_one))
print("Arc Cosine value of 1:", cmath.acos(pos_one))

When we run above program, it produces following result −

Arc Cosine value of 0: 1.0232274785475506j
Arc Cosine value of -1: 1.8115262724608532j
Arc Cosine value of 1: (1.5707963267948966+0j)

Here,we are passing non-standard cosine ratios as arguments, and then arc cosine values for these objects are calculated using cmath.acos() function.

import cmath
x=cmath.acos(0.76)
y=cmath.acos(-0.23)
print(x,y)

The result is displayed as follows −

(0.7074832117793429-0j) (1.8028740096576097-0j)

In this example, input is not a complex number. So, we will get a TypeError.

import cmath
cmath.acos("Welcome to TutorialsPoint")

The output is produced as follows −

Traceback (most recent call last):
  File "/home/cg/root/30462/main.py", line 2, in 
    cmath.acos("Welcome to TutorialsPoint")
TypeError: must be real number, not str

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