## Exercise: Iterative convergence

Consider the equation *x* = sin (*x* + *c*)
where *c* is a constant provided and *x* is a variable to be
found.

Write a function to perform the computation and then construct a program which numerically solves this equation by feeding the result of the function back into it as the next argument.

- Will it always converge?
- How can you tell when it has converged?