ref: 1c3a6fc67e6df47e49a9aa6bb13ddfb75852b99c
dir: /sys/man/2/sin/
.TH SIN 2 .SH NAME sin, cos, tan, asin, acos, atan, atan2 \- trigonometric functions .SH SYNOPSIS .B #include <u.h> .br .B #include <libc.h> .PP .B double sin(double x) .PP .B double cos(double x) .PP .B double tan(double x) .PP .B double asin(double x) .PP .B double acos(double x) .PP .B double atan(double x) .PP .B double atan2(double y, double x) .SH DESCRIPTION .I Sin, cos and .I tan return trigonometric functions of radian arguments. The magnitude of the argument should be checked by the caller to make sure the result is meaningful. .PP .I Asin returns the arc sine in the range \-π/2 to π/2. .PP .I Acos returns the arc cosine in the range 0 to π. .PP .I Atan returns the arc tangent in the range \-π/2 to π/2. .PP .I Atan2 returns the arc tangent of .I y/x in the range \-π to π. .SH SOURCE .B /sys/src/libc/port .SH SEE ALSO .IR intro (2) .SH BUGS The value of .I tan for arguments greater than about .if t 2\u\s-231\s+2\d .if n 2^31 is garbage.