A list of the squares

The procedure square-list takes a list of numbers as argument and returns a list of the squares of those numbers.

(square-list (list 1 2 3 4))
(1 4 9 16)

Here are two different definitions of square-list . Complete both of them by filling in the missing expressions:

(define (square-list items)
  (if (null? items)
      nil
      (cons <??> <??>)))

(define (square-list2 items)
  (map <??> <??>))

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(define test-list (list 3 5 7 8 21 4))

(check-equal? (square-list (list 1 2 3 4)) (list 1 4 9 16))
(check-equal? (square-list test-list) (square-list2 test-list))