arctangent

noun
arc·tan·gent | \(ˌ)ärk-ˈtan-jənt \

Definition of arctangent 

: the inverse function of the tangent if y is the tangent of θ, then θ is the arctangent of y abbreviation arctan

First Known Use of arctangent

1886, in the meaning defined above

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The first known use of arctangent was in 1886

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