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: tand.m
    path of file: ./repos/chebfun/@chebfun
    
    the code of the file until where you have to start completion: function F = tand(F, varargin)
%TAND   Tangent of a CHEBFUN, result in degrees.

    
function F = tand(F, varargin)
%TAND   Tangent of a CHEBFUN, result in degrees.
%   TAND(F) computes the tangent (in degrees) of the CHEBFUN F.
%
%   TAND(F, PREF) does the same but uses the CHEBFUNPREF object PREF when
%   computing the composition.
%
% See also ATAND, TAN.

% Copyright 2017 by The University of Oxford and The Chebfun Developers.
% See http://www.chebfun.org/ for Chebfun information.

% Call the compose method:
F = compose(F, @tand, varargin{:});

end