Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. Any of several singlevalued or multivalued functions that are inverses of the tangent function. Symbol: arctan, tan1
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
from Wiktionary, Creative Commons Attribution/ShareAlike License
Examples

The arctangent is the inverse of that, and the regular

I love that she got “arctangent” before he did, and I have every intention of looking that word up.
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This time she asks me how to divide a beggar and an arctangent.

The phaseshift of the composite waveform generated by combining sine and cosine components of the above equation can be approximated as the arctangent of β3, and can be used to estimate the timing of peak disease incidence

This function returns the arctangent of the number that you give it.
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This angle is equal to the arctangent of the ratio of ya to xa: dir a ¼ a ¼ arctan ðya = xa Þ

Consider the range of the arctangent function to be limited to values between, but not including, /2 rad and/2 rad.

These are known as the hyperbolic arcsine, hyperbolic arccosine, hyperbolic arctangent, hyper  bolic arccosecant, hyperbolic arcsecant, and hyperbolic arccotangent.

To ﬁ nd the measure of, note that it is equal to 270 (threequarters of a circle) minus the angle between the x axis and the vector a. The angle between the x axis and vector a is the arctangent of 4/3, or approximately 53 as determined using a calculator.

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