Define a procedure double that takes a procedure of one argument as argument and returns a procedure that applies the original procedure twice. For example, if inc is a procedure that adds 1 to its argument, then (double inc) should be a procedure that adds 2. What value is returned by
(((double (double double)) inc) 5)
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(define (inc x) (+ x 1)) (define (square x) (* x x)) (check-equal? (((double (double double)) inc) 5) 21) (check-equal? ((double inc) 6) 8) (check-equal? ((double square) 3) 81)