Fibonacci numbers

Finite differences formulas

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`f` |
function to differentiate |

`x` |
the |

`h` |
the step-size for evaluation |

`n` |
the maximum number of convergence steps in |

The `findiff`

formula uses the finite differences formula to
find the derivative of `f`

at `x`

. The value of `h`

is the step size of the evaluation. The function `findiff2`

provides the second derivative.

the value of the derivative

1 2 |

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