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    (define (sqrt-iter guess prevGuess x)
  (if (good-enough-new? guess prevGuess)
      guess
      (sqrt-iter (improve guess x)
                 guess
                 x)))

(define (improve guess x)
  (average guess (/ x guess)))

(define (average x y)
  (/ (+ x y) 2))

(define (good-enough-new? guess prev)
  (< (abs (- prev guess)) 0.001))

(define (square x)
  (* x x))

(define (square-root x)
  (sqrt-iter 1.0 10.0 x))

(square-root 9)