SICP exercise 1.42

From Drewiki

Problem

Let f and g be two one-argument functions. The composition f after g is defined to be the function . Define a procedure compose that implements composition. For example, if inc is a procedure that adds 1 to its argument,

evaluates to 49.

Solution

The solution is straightforward. It looks very much like its mathematical analogue:

Let's test:

Output:

49