/GNU Fortran 7

# 9.19 ASIN — Arcsine function

Description:

ASIN(X) computes the arcsine of its X (inverse of SIN(X)).

Standard:

Fortran 77 and later, for a complex argument Fortran 2008 or later

Class:

Elemental function

Syntax:

RESULT = ASIN(X)

Arguments:
 X The type shall be either REAL and a magnitude that is less than or equal to one - or be COMPLEX.
Return value:

The return value is of the same type and kind as X. The real part of the result is in radians and lies in the range -\pi/2 \leq \Re \asin(x) \leq \pi/2.

Example:
program test_asin
real(8) :: x = 0.866_8
x = asin(x)
end program test_asin
Specific names:
 Name Argument Return type Standard ASIN(X) REAL(4) X REAL(4) Fortran 77 and later DASIN(X) REAL(8) X REAL(8) Fortran 77 and later