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C:\CST1615\Lab01>perldoc -u -f atan2 =over 8 =item atan2 Y,X X<atan2> X<arctangent> X<tan> X<tangent> Returns the arctangent of Y/X in the range -PI to PI. For the tangent operation, you may use the C<Math::Trig::tan> function, or use the familiar relation: sub tan { sin($_[0]) / cos($_[0]) } The return value for C<atan2(0,0)> is implementation-defined; consult your atan2(3) manpage for more information. =back