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For the function `f(x) = cos(x)`, write Newton's formula as `x_(n+1) = x_n-f(x_n)/(f'(x_n))` for solving `f(x)=0`.

`x_(n+1)=`  


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   x  √  (   ) π ∞ DNE
( ) ( ] [ ) [ ] —∞ ∞ ∪ DNE
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