Question 4 Consider the following equations: x2 + 1 y y a) Use initial guesses of (x, y) (0.7, 1.5) to determine the positive roots of the given 2cos(x) simultaneous nonlinear equations using the two-equation Newton-Raphson method. (Round the final answers to five decimal places.) Show 3 iterations or until a tolerance of ,-0.01% is met. Use a graphical approach to verify the initial guesses for x and y given in part (a). Use MATLAB to generate a graph showing both functions on the same set of axes. Use the given initial guesses as the starting point to determine refined estimates in MATLAB using the fsolve function. (Round the final answers to four decimal places.) b) c)