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asin(3) [freebsd man page]

ASIN(3) 						   BSD Library Functions Manual 						   ASIN(3)

NAME
asin, asinf, asinl -- arc sine functions LIBRARY
Math Library (libm, -lm) SYNOPSIS
#include <math.h> double asin(double x); float asinf(float x); long double asinl(long double x); DESCRIPTION
The asin(), asinf(), and asinl() functions compute the principal value of the arc sine of x. RETURN VALUES
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. SEE ALSO
acos(3), atan(3), atan2(3), cos(3), cosh(3), fenv(3), math(3), sin(3), sinh(3), tan(3), tanh(3) STANDARDS
The asin(), asinf(), and asinl() functions conform to ISO/IEC 9899:1999 (``ISO C99''). BSD
July 31, 2008 BSD

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ASIN(3) 						   BSD Library Functions Manual 						   ASIN(3)

NAME
asin -- arc sine function SYNOPSIS
#include <math.h> double asin(double x); long double asinl(long double x); float asinf(float x); DESCRIPTION
The asin() function computes the principal value of the arc sine of x. The result is in the range [-pi/2, +pi/2]. SPECIAL VALUES
asin(+-0) returns +-0. asin(x) returns a NAN and raises the "invalid" floating-point exception for |x| > 1. VECTOR OPERATIONS
If you need to apply the asin() function to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may give significantly better performance: #include <Accelerate/Accelerate.h> vFloat vasinf(vFloat x); void vvasinf(float *y, const float *x, const int *n); void vvasin(double *y, const double *x, const int *n); 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 ISO/IEC 9899:2011. BSD
December 11, 2006 BSD

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