Solve the function f(x) = arctan (x) by the Newton-Raphson method using an Excel spreadsheet and give a printout of the spreadsheet. Use an initial guess of x = 1.35 and do eight iterations. Set up the spreadsheet as follows: Solve the function f(x) = arctan (x) by the Newton-Raphson method using an Excel spreadsheet and give a printout of the spreadsheet. Use an initial guess of x = 1.35 and do eight iterations. Set up the spreadsheet as follows