Question 4: Find and plot the polynomial of the degree 3 that would best fit the data (x.mat, y.mat) attached on the ITC. Then find y(1.2). Plot both of fitted and real curves in the same window and use legend, title and label the axis. Question 5: Write a MATLAB function for checking if a given point (x,y) is within the circle which shown in the figure below. The input arguments are x,y and the output is either true (the point is in the circle) or false (the point is not in the circle)