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Newton's method of finding a square root
(define (square-of x)
(define (average x y)
(/ (+ x y) 2))
(define (improve guess x)
(average guess (/ x guess)))
(define (good-enough? guess x)
(< (abs (- (square-of guess) x)) 0.001))
(define (sqrt-iter guess x)
(if (good-enough? guess x)
(sqrt-of (improve guess x)
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