- NAME
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asin - arc sine function.
- SYNOPSIS
#include <math.h>
double asin(double x);- DESCRIPTION
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The asin() function calculates the arc sine of x; that is the value whose sine is x. If x falls outside the range -1 to 1, asin() fails and errno is set.
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Warning
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You’ll also need to link the program against the math library (see example below) using the -lm compile/link option.
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- RETURN VALUE
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The asin() function returns the arc sine in radians and the value is mathematically defined to be between -PI/2 and PI/2 (inclusive).
- ERRORS
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EDOM - x is out of range [-1, 1].
- SEE ALSO
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acos, atan, atan2, cos, sin, tan
- EXAMPLE
link:src/asin.c[role=include]- OUTPUT
$ gcc -Wall -lm asin.c $ ./a.out ASIN(-1.000000) = -1.570796 ASIN(-0.900000) = -1.119769 ASIN(-0.800000) = -0.927295 ASIN(-0.700000) = -0.775397 ASIN(-0.600000) = -0.643501 ASIN(-0.500000) = -0.523599 ASIN(-0.400000) = -0.411517 ASIN(-0.300000) = -0.304693 ASIN(-0.200000) = -0.201358 ASIN(-0.100000) = -0.100167 ASIN(0.000000) = 0.000000 ASIN(0.100000) = 0.100167 ASIN(0.200000) = 0.201358 ASIN(0.300000) = 0.304693 ASIN(0.400000) = 0.411517 ASIN(0.500000) = 0.523599 ASIN(0.600000) = 0.643501 ASIN(0.700000) = 0.775398 ASIN(0.800000) = 0.927295 ASIN(0.900000) = 1.119770