Atn (Tag-based PE function)

Return the inverse (or arc) tangent of an integer or real number. The inverse tangent of x is the angle in radians whose tangent is equal to x.

Syntax

Atn(x)

Arguments

x

Must be an integer or real number

Returns

The inverse tangent of x, in radians.

Exceptions

Returns an error if x is not an integer or real number.

Example

Atn(1) [Returns 0.7854]

Atn(-2.2) [Returns -1.1442]

Atn('att1')

Atn('att1' - 'att2')