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)
49

> ((compose square inc) 6)
49

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