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The Newton – Raphson method is used to find the roots of the equation 

                                              f(x) = x- cos$\pi$x                            0$\le$x$\leq$1.

If the initial guess for the root is 0.5, then the value of x after the first iteration is

  1. 1.02
  2. 0.62
  3. 0.55
  4. 0.38
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