When I read the SICP, there is a procedure evaluating the definite integral
of a function f between the limits a and b:
(define (integral f a b dx)
(define (add-dx x) (+ x dx))
(* (sum f (+ a (/ dx 2.0)) add-dx b)
dx))
when I tried to run it on DrRacket, it said that: "define: expected only one
expression for the function body, but found 1 extra part" for this part
"(* (sum f (+ a (/ dx 2.0)) add-dx b)
dx))"
I think that what DrRacket said makes sense, but the procedure is clearly on
the the book. So I am really confused. Please help! Thanks!
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