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The Newton-Raphson iteration $x_{n+1} = \frac{1}{2}\left(x_n+\frac{R}{x_n}\right)$ can be used to compute the

1. square of R
2. reciprocal of R
3. square root of R
4. logarithm of R
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The given expression can be rewritten as,

xn+1 = xn - (xn2 -R)/2xn

therefore, it computes the square root R.

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