Manpage of ASIN

ASIN

Section: NEWLIB (3)
Updated: 2005 Feb 23
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NAME

1.4 `asin', `asinf'--arc sine

SYNOPSIS

     #include <math.h>
     double asin(double X);
     float asinf(float X);

DESCRIPTION

`asin' computes the inverse sine (arc sine) of the argument X. Arguments to `asin' must be in the range -1 to 1.

`asinf' is identical to `asin', other than taking and returning floats.

You can modify error handling for these routines using `matherr'.

RETURNS

`asin' returns values in radians, in the range of -pi/2 to pi/2.

If X is not in the range -1 to 1, `asin' and `asinf' return NaN (not a number), set the global variable `errno' to `EDOM', and issue a `DOMAIN error' message.

You can change this error treatment using `matherr'.