Neighboring functions:

abs
accept
alarm
atan2
bind
binmode
bless
caller
chdir

atan2

Examples:
atan2-Y,X
Description:

Returns the arctangent of Y/X in the range -PI to PI.

For the tangent operation, you may use the Math::Trig::tan function, or use the familiar relation:

    sub tan { sin($_[0]) / cos($_[0])  }  

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