Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. Abbreviation of arctangent.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. the inverse function of the tangent; the angle that has a tangent equal to a given number
Etymologies
Examples

"arctan"; opchTbl [6]. code = 7; opchTbl [6]. grade =

I was once told that the gradient on a road sign is not arctan but rather arcsin  i.e. 10% is 1m up for 10m on the slope.

The Smallest PisotVijayaraghavan number. arctan (1/2)/Pi, to 1024 digits. product (1+1/n**3, n = 1. .infinity) exp (Pi*sqrt (163)), the Ramanujan number

I fitted a simple arctan function through their water storage curve and added that to Stefan's already extended script.

Calculate the equivalent 35mm film focal length from the AOV AOV = arctan (28.62/72) * 2

And, he apparently is well educated, as he knows the number pi and trigonometrical functions like sin, cos, tan, arcsin, arccos, arctan and the functions sqrt and exp.
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In order to convert the coordinates of a point (x0, y0) in Cartesian coordinates to a point (0, r0) in NPC, use these formulas: 0 ¼ arctan ðx0 = y0 Þ if y0 >

The angle is the arctangent of the ratio of the absolute value of the capacitive reactance to the resistance: RC ¼ arctan ðjXC j = RÞ

CHAPTER 3 Graphs and Inverses GRAPH OF ARCTANGENT FUNCTION Figure 313 is a graph of the function y ¼ arctan x (or y ¼ tanÀ1 x).

The arctangent function, y ¼ arctan x, is de ﬁ ned for (a) all values of x (b) x >
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