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f1a n *) (* Naive binary recursion: F(n) = F(n-1) + F(n-2) *) let rec fib Lazy (* The lazy-evaluated list is head of the list and a promise of the tail. The Fibonacci sequence is defined recursively. The nth Fibonacci number is the sum of the two Fibonacci numbers that precede it. (* Task : Write a tail recursive implementation of the Fibonacci sequence. *. * Author : Dhammika Marasinghe | github.com/dhammika-marasinghe. Tail Recursive Fibonacci int fib_tr(int prev, int cur, int n){ if(n==0) return cur; return fib_tr(cur, prev + cur, n-1);. } int fib(int n){.A concise and idiomatic (I think) implementation (which happens to be tail recursive) but without your / 2 optimisation would be: let fib n = let rec tail this is simple fibonacci function. if I don't use tail recursion it's I think it's redundant (ocaml can infer it) but can be useful for documentation. best performance. Write a tail-recursive function fib_tr that also computes the nth Fibonacci number. Recall that a tail-recursive function is a recursive