Problem 3.3: Exp (100 pts)

For this problem, you may use the naturals, combine-with, factorials defined above and built-in function expt. We highly recommend you do not define any other helper functions. Such problems are likely to appear on final exam.

Write function exp, which returns a stream where the nth term represents the degree-n polynomial expantion for $e^x$, which is $\sum\limits_{i=0}^n{{x^i} \over {i!}}$.

(define (exp x)
  'YOUR-CODE-HERE
)

;;; Tests
; scm> (slice (exp 2) 0 5)
; (1 3 5 6.333333333 7)