using the substitution model

example

• (define (square i) (* i i))
• (define (sum-of-squares i j) (+ (square i) (square j)))
• (sum-of-squares 3 4)
• (+ (square 3) (square 4))
• (+ (* 3 3) (* 4 4))
• (+ (* 3 3) 16)
• (+ 9 16)
• 25

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