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Man Pages
ASIN(3) FreeBSD Library Functions Manual ASIN(3)

asin, asinf, asinl
arc sine functions

Math Library (libm, -lm)

#include <math.h>

double
asin(double x);

float
asinf(float x);

long double
asinl(long double x);

The asin(), asinf(), and asinl() functions compute the principal value of the arc sine of x.

These functions return the arc sine in the range [-pi/2, +pi/2] radians. If:
|
x
| > 1

asin(x) raises an invalid exception and returns an NaN.

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

The asin(), asinf(), and asinl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).
July 31, 2008 FreeBSD 13.1-RELEASE

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