(define (solution  x y z) (cond ((and (>= x z) (>= y z)) (sum-of-squares x y))
                                           ((and (>= y x) (>= z x)) (sum-of-squares y z))
                                           (else (sum-of-squares x z))))
(define (square num) (* num num))
(define (sum-of-squares num1 num2) (+ (square num1) (square num2)))