Gradient of a function handle

I currently have a function

function y = foo(x)

y = cos(x(1)^2-x(2))*x(3)^5/sum(x)

where x is then a 3 dimensional user defined point say [1 1 1] in another function

My objective is to call the function handle in another function, enter a user defined point say [1 1 1], and then take the gradient of it by using syms.

is there a matlab function to convert these files?