# arc tangent

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## arc tangent

[¦ärk ′tan·jənt]
(mathematics)
Also known as antitangent; inverse tangent.
For a number x, any angle whose tangent equals x.
For a number x, the angle between -π/2 radians and π/2 radians whose tangent equals x ; it is the value at x of the inverse of the restriction of the tangent function to the interval between -π/2 and π/2.
References in periodicals archive ?
The method of Hurwitz-Radon Matrices (MHR) enables interpolation of two-dimensional curves using different coefficients [gamma]: polynomial, sinusoidal, cosinusoidal, tangent, cotangent, logarithmic, exponential, arcsin, arccos, arctan, arcctg or power function [16], also inverse functions.
1 Applications: some identities involving the arctan function
n] [right arrow] x > 0, by continuity of arctan one obtains the famous formula
arctan (1/it) = {[pi]/2 if - 1 < t < 1; 0 if 1 < |t|.
cp] = [gamma]/2[pi] (arctan x + b/z - arctan x - b/z) + i [gamma]/4[pi] ln [z.
The phase difference [Delta]([Omega]) = arctan (G[double prime]([Omega])/G[prime]([Omega])) is highly reduced, indicating a significant increase in elastic TPV properties.
5 [degrees]) or 2 arctan [-square root of 2] the maximum number of carbon atoms per chain, [N.

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