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Root of nonlinear function

`x = fzero(fun,x0)`

`x = fzero(fun,x0,options)`

`x = fzero(problem)`

```
[x,fval,exitflag,output]
= fzero(___)
```

[1] Brent, R., *Algorithms for Minimization
Without Derivatives*, Prentice-Hall, 1973.

[2] Forsythe, G. E., M. A. Malcolm, and C.
B. Moler, *Computer Methods for Mathematical Computations*,
Prentice-Hall, 1976.

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