ATAN(III) 4/30/73 ATAN(III)
NAME
atan - arc tangent function
SYNOPSIS
jsr r5,atan[2]
double atan(x)
double x;
double atan2(x, y)
double x, y;
DESCRIPTION
The atan entry returns the arc tangent of fr0 in fr0; from
C, the arc tangent of x is returned. The range is -π/2 to
π/2. The atan2 entry returns the arc tangent of fr0/fr1 in
fr0; from C, the arc tangent of x/y is returned. The range
is -π to π.
DIAGNOSTIC
There is no error return.
BUGS