Symbolic Mathematics

Most symbolic expressions can be represented by expressions in single quotes such as

'x ^ 2 + sin(x)'

but symbolic matrices should be created with function sym( ), e.g.,

M = sym('[a b c; d e f]')   % a 2-by-3 symbolic matrix


diff('x ^ 2 + sin(x)')      % derivative of a function
diff x^2+sin(x)             % the same as above; there is a space after diff,
                            % but no space is allowed within the expression
diff('x^3 * y^2', 'x', 2)   % second-order derivative with respect to x
subs('x^3 * y^2', 'a', 'x') % substitute a for x in x^3y^2

Use int( ) for the symbolic integral and determ( ) for the determinant of a symbolic matrix.
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