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.
