atan()

static double xtd::math::atan ( double  value )

static

Returns the angle whose tangent is the specified number.

Parameters

value

A number representing a tangent.

Returns

An angle, A, measured in radians, such that -PI/2 <= ? <= PI/2.
-or-
math::NaN if value equals math::NaN, -PI/2 rounded to double precision (-1.5707963267949) if d equals math::negative_infinity, or PI/2 rounded to double precision (1.5707963267949) if d equals math::positive_infinity