4. In this exercise you are going to implement a simple numerical method for integration using Python. Let f(x)=3ex3. Take a screenshot of your code and results or attach it. (a) Write a code in Python that computes trapezoid rule to approximate 013ex3dx taking as input the number of subintervals n. (b) Using the algorithm you implemented compute the result of the trapezoid rule when n=50. (c) Compute f(x) (d) Find an upper-bound of the aboslute error in the estimate given by the trapezoid rule of 013ex3dx