sin.3

UNIX v6源代码 这几乎是最经典的unix版本 unix操作系统设计和莱昂氏unix源代码分析都是用的该版

.th SIN III 3/15/72
.sh NAME
sin, cos \*- trigonometric functions
.sh SYNOPSIS
.nf
.ft B
jsr	pc,sin (cos)
.s3
double sin(x)
double x;
.s3
double cos(x)
double x;
.fi
.ft R
.sh DESCRIPTION
The
sine (cosine) of fr0 (resp. \fBx\fR), measured in radians,
is returned (in fr0).
.s3
The magnitude of the argument should be checked
by the caller to make sure the result is meaningful.
.sh BUGS