projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 05dda90f C |
1 | .TH SIN 3M "19 January 1983" |
| 2 | .SH NAME | |
| 3 | sin, cos, tan, asin, acos, atan, atan2 \- trigonometric functions | |
| 4 | .SH SYNOPSIS | |
| 5 | .nf | |
| 6 | .B #include <math.h> | |
| 7 | .PP | |
| 8 | .B double sin(x) | |
| 9 | .B double x; | |
| 10 | .PP | |
| 11 | .B double cos(x) | |
| 12 | .B double x; | |
| 13 | .PP | |
| 14 | .B double asin(x) | |
| 15 | .B double x; | |
| 16 | .PP | |
| 17 | .B double acos(x) | |
| 18 | .B double x; | |
| 19 | .PP | |
| 20 | .B double atan(x) | |
| 21 | .B double x; | |
| 22 | .PP | |
| 23 | .B double atan2(x, y) | |
| 24 | .B double x, y; | |
| 25 | .fi | |
| 26 | .SH DESCRIPTION | |
| 27 | .I Sin, cos | |
| 28 | and | |
| 29 | .I tan | |
| 30 | return trigonometric functions of radian arguments. | |
| 31 | The magnitude of the argument should be checked | |
| 32 | by the caller to make sure the result is meaningful. | |
| 33 | .PP | |
| 34 | .I Asin | |
| 35 | returns the arc sin in the range \-\(*p/2 to \(*p/2. | |
| 36 | .PP | |
| 37 | .I Acos | |
| 38 | returns the arc cosine in the range 0 to \(*p. | |
| 39 | .PP | |
| 40 | .I Atan | |
| 41 | returns the arc tangent of | |
| 42 | .I x | |
| 43 | in the range \-\(*p/2 to \(*p/2. | |
| 44 | .PP | |
| 45 | .I Atan2 | |
| 46 | returns the arc tangent of | |
| 47 | .I x/y | |
| 48 | in the range \-\(*p to \(*p. | |
| 49 | .SH DIAGNOSTICS | |
| 50 | Arguments of magnitude greater than 1 cause | |
| 51 | .I asin | |
| 52 | and | |
| 53 | .I acos | |
| 54 | to return value 0; | |
| 55 | .I errno | |
| 56 | is set to EDOM. The value of | |
| 57 | .I tan | |
| 58 | at its singular points is a huge number, and | |
| 59 | .I errno | |
| 60 | is set to ERANGE. | |
| 61 | .SH BUGS | |
| 62 | The value of | |
| 63 | .I tan | |
| 64 | for arguments greater than about 2**31 is garbage. |