# Fortran Wiki asin

## Description

asin(x) computes the arcsine of its x (inverse of sin(x)).

## Standard

FORTRAN 77 and later

## Class

Elemental function

## Syntax

result = asin(x)

## Arguments

• x - The type shall be real, and a magnitude that is less than one.

## Return value

The return value is of type real and it lies in the range $-\pi /2\le asin\left(x\right)\le \pi /2$. The kind type parameter is the same as x.

## Example

program test_asin
real(8) :: x = 0.866_8
x = asin(x)
end program test_asin