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- (define (sqrt-iter guess x)
- (if (good-enough? guess x)
- guess
- (sqrt-iter (improve guess x)
- x)))
- (define (improve guess x)
- (average guess (/ x guess)))
- (define (average x y)
- (/ (+ x y) 2))
- (define (good-enough? guess x)
- (< (abs (- (square guess) x)) 0.001))
- (define (sqrt x)
- (sqrt-iter 1.0 x))
- (define (abs x)
- (if (>= x 0) x
- (- x)))
- (define (square x)
- (* x x))
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