Exercise 1.42 of SICP

Exercise 1.42: Let f and g be two one-argument functions. The composition f after g is defined to be the function $ x \mapsto f(g(x)) $. Define a procedure compose that implements composition. For example, if inc is a procedure that adds 1 to its argument,

((compose square inc) 6)
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(define (compose f g)
  (lambda (x) (f (g x))))

(define (square x) (* x x))
(define (inc n) (+ n 1))

> ((compose square inc) 6)
49