1ASIN(3) Linux Programmer's Manual ASIN(3)
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6 asin, asinf, asinl - arc sine function
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9 #include <math.h>
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11 double asin(double x);
12 float asinf(float x);
13 long double asinl(long double x);
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15 Link with -lm.
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17 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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19 asinf(), asinl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600
20 || _ISOC99_SOURCE; or cc -std=c99
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23 The asin() function calculates the principal value of the arc sine of
24 x; that is the value whose sine is x.
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27 On success, these functions return the principal value of the arc sine
28 of x in radians; the return value is in the range [-pi/2, pi/2].
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30 If x is a NaN, a NaN is returned.
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32 If x is +0 (-0), +0 (-0) is returned.
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34 If x is outside the range [-1, 1], a domain error occurs, and a NaN is
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38 See math_error(7) for information on how to determine whether an error
39 has occurred when calling these functions.
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41 The following errors can occur:
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43 Domain error: x is outside the range [-1, 1]
44 errno is set to EDOM. An invalid floating-point exception
45 (FE_INVALID) is raised.
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48 C99, POSIX.1-2001. The variant returning double also conforms to SVr4,
49 4.3BSD, C89.
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52 acos(3), atan(3), atan2(3), casin(3), cos(3), sin(3), tan(3)
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55 This page is part of release 3.22 of the Linux man-pages project. A
56 description of the project, and information about reporting bugs, can
57 be found at http://www.kernel.org/doc/man-pages/.
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61 2008-08-05 ASIN(3)