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A term also known as "inverse tan" involved with trignonometry used in mathematics. Utilized when trying to determine one angle of a (i.e.) right angle triangle. Involved with dividing the 2nd function of tan by the opposite and the adjacent numbers which normally would be given. (i.e. Determine the angle D of this right angle triangle. Opposite = 14 Adjacent = 10 ... Tan-1 {14 divided by 10} Angle D = your answer = 84.28) Also related to the 2nd function Of Sin and Cos. (2nd function = Tan-1)
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