# Newtons iteration as a map - Part 2

It is fun to look at how the iterates move in newton’s iterations in the case of \(\sin(x)\) function. The iterate derived in the previous post is as follows

\[x(n+1) = x(n) - \tan(x(n))\]If one start at start around 2 we quickly converge to the solution. :-)

But what happens when we start near a point where derivative of the sin function is zero ? It goes into oblivion.

Moral of the story is if you are using newtons iteration one must be careful if the derivative of the function is nearly zero.

To be continued.

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