Problem 4 Write a function in Matlab to compute e". Your function should implement a truncated version of the infinite sum e* = limu k=0 Compare your function with the built-in function exp(x) for r = +1, +10, 15. Specifically, for each , how many terms n do you need to achieve a relative error smaller than 10-8? Are the results for x > 0 different from those for x