Programming Perl

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3.2.6 atan2

atan2 Y, X

This function returns the arctangent of Y/X in the range -[pi] to [pi]. A quick way to get an approximate value of [pi] 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]) }

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