mathjs/docs/reference/functions/atan.md

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Function atan #

Calculate the inverse tangent of a value.

To avoid confusion with matrix arctangent, this function does not apply to matrices.

Syntax #

math.atan(x)

Parameters #

Parameter	Type	Description
x	number | BigNumber | Complex	Function input

Returns #

Type	Description
number | BigNumber | Complex	The arc tangent of x

Throws #

Type	Description

Examples #

math.atan(0.5)           // returns number 0.4636476090008061
math.atan(2)             // returns number 1.1071487177940904
math.atan(math.tan(1.5)) // returns number 1.5

See also #

tan, asin, acos