acos()

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

static

Returns the angle whose cosine is the specified number.

Parameters

value

A number representing a cosine, where -1 <= value <= 1.

Returns

An angle, A, measured in radians, such that 0 <= A <= PI.
-or-
math::NaN if value < -1 or d > 1.