i need to change a mathematical formula inside a function from a script

2014 3 4
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更新时间：2014 3 5
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hi, i need to change a mathematical formula inside a function from a script. i think i shuld use a syms, so far i haven't realized how to do so,
clc
syms x
variable=x;
x=sym(variable);
a=cos(x);
a=subs(a,x,2)
this is my code above for a simple example, after substitute the x to 2 using subs i need to find a way to place this "new" formula in a function, matlab identify a as a 1x1 sym
any suggestions?

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