asinf(3)

asinf3

Arc sine functions

Part of asin(3).

Usage

#include <math.h>

double

asin(double x);

float

asinf(float x);

long double

asinl(long double x);

Library

Math Library (libm, -lm)

Overview

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 [-/2, +/2] radians. If:

|x| > 1

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

Releases

83 releases since FreeBSD 2.2.2-RELEASE; the text changed 46 times.

  1. 2.2.2–2.2.8
  2. 2.2.9
  3. 3.0–3.2
  4. 3.3–3.5.1
  5. 4.0–4.2
  6. 4.3
  7. 4.4
  8. 4.5–4.11
  9. 5.0–5.2.1
  10. 5.3
  11. 5.4–5.5
  12. 6.0–6.2
  13. 6.3
  14. 6.4
  15. 7.0
  16. 7.1
  17. 7.2
  18. 7.3
  19. 7.4
  20. 8.0
  21. 8.1
  22. 8.2
  23. 8.3
  24. 8.4
  25. 9.0
  26. 9.1
  27. 9.2
  28. 9.3
  29. 10.0
  30. 10.1
  31. 10.2
  32. 10.3
  33. 10.4
  34. 11.0
  35. 11.1
  36. 11.2
  37. 11.3
  38. 11.4
  39. 12.0
  40. 12.1
  41. 12.2
  42. 12.3
  43. 12.4
  44. 13.0
  45. 13.1–13.2
  46. 13.3–14.5
  47. 15.0–16.0

Standards

The asin(), asinf(), and asinl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).

From base 16.0-CURRENT-20261027-61c70dc16a79 in FreeBSD 16.0-CURRENT (2026-10-27). Parsed by carta from the page's mdoc source.