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simpson formula added by int0X80 on Sat Jan 26 18:12:42 2013

(define (sum f a next b)
       (if (> a b)
              0
           (+ (f a)
             (sum f (next a) next b))))


(define (cube x) (* x x x))
(define (simpson-integral a b evenN)
	(define h  (/ (- b a) evenN))
 	(define (next t) (+ a (* t h)))
	(*  (sum cube a next b) (/ h 3)))
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What's the R5RS procedure to access the second element of a pair?
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