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Meaning of arc tangent

arc' tan'gent

Pronunciation: [key]
— Trig. Trig.
  1. the angle, measured in radians, that has a tangent equal to a given number. Abbr.: arc tan; Symbol: tan&hasp; Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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