Exercise 1.42.  Let f and g be two one-argument functions. The composition f 
after g is defined to be the function x ↦ 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))))