Procedure for multiplying series
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 sin²x + cos²x = 1, using the series from exercise 3.59.
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