public static function arccot($z)
    {
        if (!($z instanceof Complex)) $z = static::parse($z);

        return static::sub(M_PI/2, static::arctan($z));
    }
public static function arccot($z)
    {
        if (!($z instanceof Complex)) $z = static::parse($z);

        return static::sub(M_PI/2, static::arctan($z));
    }
public static function arccot ( $ z ) { if ( ! ( $ z instanceof Complex ) ) $ z = static :: parse ( $ z ) ; return static :: sub ( M_PI / 2 , static :: arctan ( $ z ) ) ; }
complex inverse cotangent function

Complex::arccot($z) computes and returns the principal branch of arccot($z)


@param mixed $z (Complex, or parsable to Complex)
@retval Complex
complex inverse cotangent function