(define (solve-2nd a b dt y0 dy0) (define y (integral (delay dy) y0 dt)) (define dy (integral (delay ddy) dy0 dt)) (define ddy (add-streams (scale-stream dy a) (scale-stream ddy b))) y)

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# Exercise 3.78

(define (solve-2nd a b dt y0 dy0) (define y (integral (delay dy) y0 dt)) (define dy (integral (delay ddy) dy0 dt)) (define ddy (add-streams (scale-stream dy a) (scale-stream ddy b))) y)

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