June 2002
Beginner
759 pages
80h 42m
English
atan2
atan2 y, x
Returns the arctangent of
y /
xin the range -π to π. A quick way to
get an approximate value of π is to say:
$pi = atan2(1,1) * 4;
For the tangent operation, you may use the POSIX::tan( ) function, or use the
familiar relation:
sub tan { sin($_[0]) / cos($_[0]) }