You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: HELP_DCM2euler.m
    path of file: ./repos/GIBBON/docs
    
    the code of the file until where you have to start completion: %% DCM2euler
% Below is a demonstration of the features of the |DCM2euler| function

%
    
function

%%
clear; close all; clc;

%% Syntax
% |[a]=DCM2euler(Q);|

%% Description 
% This function is the inverse of the euler2DCM function. The Euler angles
% |a| are derived based on the input rotatin tensor |Q|. 

%% Examples 
% 

%%
% Plot settings
fontSize=25;

%% Retrieving the Euler andles from a rotation tensor

%% 
% Get example patch data
[F,V]=parasaurolophus;

%%
% Defining sets of true Euler angles for X, Y and Z axis rotation
a_true=[0.25*pi 0.25*pi -0.25*pi]

%%
% Use |euler2DCM| function to define the rotation tensor
[Q]=euler2DCM(a_true);

%%
% Use |DCM2euler| to retrieve the Euler angles
a_fit=DCM2euler(Q)

%% Handling symbolic expressions

try
    syms a b c
    
    a_true=[a b c]
    Q=euler2DCM(a_true);
    
    a_fit=DCM2euler(Q)
    
catch
    warning('Symbolic toolbox likely missing')
end