Python math.asin() - Arc / Inverse Sine

Python math.asin()

math.asin() function returns the inverse sine of given number.

The return value is angle in radians.

The syntax to call asin() function is

math.asin(x)

where

Parameter	Required	Description
x	Yes	A number in the range [-1, 1].

Note: If x is outside the allowed range, then asin(x) raises a ValueError.

In the following example, we find the inverse sine of 0.5 using asin() function of math module.

Python Program

import math

x = 0.5
result = math.asin(x)
print('asin(x) :', result, 'radians')

Output

asin(x) : 0.5235987755982988 radians

We can convert the returned radians into degrees using math.degrees() function.

In the following example, we find the inverse sine of 0.5 using asin() function and convert this returned radians to degrees.

Python Program

import math

x = 0.5
result = math.asin(x)
result = math.degrees(result)
print('asin(x) :', result, 'degrees')

Output

asin(x) : 29.999999999999996 degrees

In this Python Examples tutorial, we learned the syntax of, and examples for math.asin() function.