To calculate the arctangent

The function returns the arctangent of a number.

Syntax

atan(number)

Return

number

Example

atan(x) to calculate the arctangent of a given number x between -1 and 1.

atan(15)

Result: 1.5042281630190728

See also

atan2 which calculates the arctangent of the quotient.

tan which calculates the tangent.