function acotd( x ) {
	return addon( x );
}
Computes the arccotangent (in degrees) of a double-precision floating-point number.

@private
@param {number} x - input value
@returns {number} arccotangent (in degrees)

@example
var v = acotd( 0.0 );
// returns 90.0

@example
var v = acotd( Math.sqrt( 3 ) );
// returns ~30.0

@example
var v = acotd( 1 );
// returns 45.0

@example
var v = acotd( Math.sqrt( 3 ) / 3 );
// returns ~60.0

@example
var v = acotd( NaN );
// returns NaN