git: 9front

ref: 61373d868f00d66fa2d00b35d05d52c6b2983f05
dir: /sys/man/2/sin/

View raw version
.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.