【SICP练习】129 练习3.60
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练习3-60
原文
Exercise 3.60. With power series represented as streams of coefficients as in exercise 3.59, adding series is implemented by add-streams. Complete the definition of the following procedure for multiplying series:
(define (mul-series s1 s2) (cons-stream <??> (add-streams <??> <??>)))
You can test your procedure by verifying that sin2 x + cos2 x = 1, using the series from exercise 3.59.
代码
(define (mul-series s1 s2) (cons-stream (* (stream-car s1) (stream-car s2)) (add-streams (mul-streams (stream-cdr s1) (stream-cdr s2)) (mul-series s1 s2))))
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