asin(3) - NetBSD Manual Pages

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ASIN(3)                   NetBSD Programmer's Manual                   ASIN(3)


NAME

     asin - arc sine function


SYNOPSIS

     #include <math.h>

     double
     asin(double x);

     float
     asinf(float x);


DESCRIPTION

     The asin() and asinf() functions compute the principal value of the arc
     sine of x in the range [-pi/2, +pi/2].


RETURN VALUES

     If |x|>1, asin(x) and asinf(x) return NaN and set the global variable
     errno to EDOM.


SEE ALSO

     acos(3),  atan(3),  atan2(3),  cos(3),  cosh(3),  sin(3),  sinh(3),
     tan(3),  tanh(3),  math(3)


STANDARDS

     The asin() function conforms to ANSI X3.159-1989 (``ANSI C'').

4.4BSD                            May 2, 1991                                1